3355

12 files changed, 450 insertions, 450 deletions

diff --git a/html/edit/001-editor.mu.html b/html/edit/001-editor.mu.html
index 6118097e..8eec4b3f 100644
--- a/html/edit/001-editor.mu.html
+++ b/html/edit/001-editor.mu.html
@@ -37,7 +37,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="Comment"># temporary main for this layer: just render the given text at the given</span>
 <span class="Comment"># screen dimensions, then stop</span>
-<span class="muRecipe">def!</span> main text:address:array:character [
+<span class="muRecipe">def!</span> main text:text [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
   open-console
@@ -51,8 +51,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-initially-prints-text-to-screen [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
   run [
-    <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
-    new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+    <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
+    new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   ]
   screen-should-contain [
     <span class="Comment"># top line of screen reserved for menu</span>
@@ -83,7 +83,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="Comment"># creates a new editor widget and renders its initial appearance to screen</span>
 <span class="Comment">#   top/left/right constrain the screen area available to the new editor</span>
 <span class="Comment">#   right is exclusive</span>
-<span class="muRecipe">def</span> new-editor s:address:array:character, screen:address:screen, left:number, right:number<span class="muRecipe"> -&gt; </span>result:address:editor-data, screen:address:screen [
+<span class="muRecipe">def</span> new-editor s:text, screen:address:screen, left:number, right:number<span class="muRecipe"> -&gt; </span>result:address:editor-data, screen:address:screen [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
   <span class="Comment"># no clipping of bounds</span>
@@ -106,7 +106,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="Constant">  &lt;editor-initialization&gt;</span>
 ]
 
-<span class="muRecipe">def</span> insert-text editor:address:editor-data, text:address:array:character<span class="muRecipe"> -&gt; </span>editor:address:editor-data [
+<span class="muRecipe">def</span> insert-text editor:address:editor-data, text:text<span class="muRecipe"> -&gt; </span>editor:address:editor-data [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
   <span class="Comment"># early exit if text is empty</span>
@@ -292,9 +292,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-initially-prints-multiple-lines [
   assume-screen <span class="Constant">5/width</span>, <span class="Constant">5/height</span>
   run [
-    s:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+    s:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def]</span>
-    new-editor s:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+    new-editor s:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   ]
   screen-should-contain [
    <span class="Constant"> .     .</span>
@@ -307,8 +307,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-initially-handles-offsets [
   assume-screen <span class="Constant">5/width</span>, <span class="Constant">5/height</span>
   run [
-    s:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
-    new-editor s:address:array:character, screen:address:screen, <span class="Constant">1/left</span>, <span class="Constant">5/right</span>
+    s:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
+    new-editor s:text, screen:address:screen, <span class="Constant">1/left</span>, <span class="Constant">5/right</span>
   ]
   screen-should-contain [
    <span class="Constant"> .     .</span>
@@ -320,9 +320,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-initially-prints-multiple-lines-at-offset [
   assume-screen <span class="Constant">5/width</span>, <span class="Constant">5/height</span>
   run [
-    s:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+    s:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def]</span>
-    new-editor s:address:array:character, screen:address:screen, <span class="Constant">1/left</span>, <span class="Constant">5/right</span>
+    new-editor s:text, screen:address:screen, <span class="Constant">1/left</span>, <span class="Constant">5/right</span>
   ]
   screen-should-contain [
    <span class="Constant"> .     .</span>
@@ -335,8 +335,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-initially-wraps-long-lines [
   assume-screen <span class="Constant">5/width</span>, <span class="Constant">5/height</span>
   run [
-    s:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc def]</span>
-    new-editor s:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+    s:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc def]</span>
+    new-editor s:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   ]
   screen-should-contain [
    <span class="Constant"> .     .</span>
@@ -355,8 +355,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-initially-wraps-barely-long-lines [
   assume-screen <span class="Constant">5/width</span>, <span class="Constant">5/height</span>
   run [
-    s:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abcde]</span>
-    new-editor s:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+    s:text<span class="Special"> &lt;- </span>new <span class="Constant">[abcde]</span>
+    new-editor s:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   ]
   <span class="Comment"># still wrap, even though the line would fit. We need room to click on the</span>
   <span class="Comment"># end of the line</span>
@@ -377,8 +377,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-initializes-empty-text [
   assume-screen <span class="Constant">5/width</span>, <span class="Constant">5/height</span>
   run [
-    <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-    <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+    <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+    <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
     <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>get *<span class="Constant">2</span>:address:editor-data, <span class="Constant">cursor-row:offset</span>
     <span class="Constant">4</span>:number<span class="Special"> &lt;- </span>get *<span class="Constant">2</span>:address:editor-data, <span class="Constant">cursor-column:offset</span>
   ]
@@ -398,10 +398,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> render-colors-comments [
   assume-screen <span class="Constant">5/width</span>, <span class="Constant">5/height</span>
   run [
-    s:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+    s:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant"># de</span>
 <span class="Constant">f]</span>
-    new-editor s:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+    new-editor s:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   ]
   screen-should-contain [
    <span class="Constant"> .     .</span>
@@ -479,10 +479,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> render-colors-assignment [
   assume-screen <span class="Constant">8/width</span>, <span class="Constant">5/height</span>
   run [
-    s:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+    s:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">d &lt;- e</span>
 <span class="Constant">f]</span>
-    new-editor s:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">8/right</span>
+    new-editor s:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">8/right</span>
   ]
   screen-should-contain [
    <span class="Constant"> .        .</span>
diff --git a/html/edit/002-typing.mu.html b/html/edit/002-typing.mu.html
index 69e1b614..bba168f6 100644
--- a/html/edit/002-typing.mu.html
+++ b/html/edit/002-typing.mu.html
@@ -37,7 +37,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="Comment"># temporary main: interactive editor</span>
 <span class="Comment"># hit ctrl-c to exit</span>
-<span class="muRecipe">def!</span> main text:address:array:character [
+<span class="muRecipe">def!</span> main text:text [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
   open-console
@@ -317,8 +317,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-handles-empty-event-queue [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   assume-console <span class="Constant">[]</span>
   run [
@@ -334,8 +334,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-handles-mouse-clicks [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   assume-console [
@@ -361,8 +361,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-handles-mouse-clicks-outside-text [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span class="Constant">  $clear-trace</span>
   assume-console [
     left-click <span class="Constant">1</span>, <span class="Constant">7</span>  <span class="Comment"># last line, to the right of text</span>
@@ -381,9 +381,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-handles-mouse-clicks-outside-text-2 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span class="Constant">  $clear-trace</span>
   assume-console [
     left-click <span class="Constant">1</span>, <span class="Constant">7</span>  <span class="Comment"># interior line, to the right of text</span>
@@ -402,9 +402,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-handles-mouse-clicks-outside-text-3 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span class="Constant">  $clear-trace</span>
   assume-console [
     left-click <span class="Constant">3</span>, <span class="Constant">7</span>  <span class="Comment"># below text</span>
@@ -423,9 +423,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-handles-mouse-clicks-outside-column [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
   <span class="Comment"># editor occupies only left half of screen</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   assume-console [
@@ -452,8 +452,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-handles-mouse-clicks-in-menu-area [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   assume-console [
@@ -474,8 +474,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-inserts-characters-into-empty-editor [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   assume-console [
@@ -495,8 +495,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-inserts-characters-at-cursor [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   <span class="Comment"># type two letters at different places</span>
@@ -519,8 +519,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-inserts-characters-at-cursor-2 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   assume-console [
@@ -541,9 +541,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-inserts-characters-at-cursor-5 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">d]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   assume-console [
@@ -565,8 +565,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-inserts-characters-at-cursor-3 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   assume-console [
@@ -587,9 +587,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-inserts-characters-at-cursor-4 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">d]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   assume-console [
@@ -611,9 +611,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-inserts-characters-at-cursor-6 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">d]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   assume-console [
@@ -635,8 +635,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-moves-cursor-after-inserting-characters [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ab]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[ab]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   assume-console [
     type <span class="Constant">[01]</span>
@@ -656,8 +656,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-wraps-line-on-insert [
   assume-screen <span class="Constant">5/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># type a letter</span>
   assume-console [
@@ -694,9 +694,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-wraps-line-on-insert-2 [
   <span class="Comment"># create an editor with some text</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abcdefg</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abcdefg</span>
 <span class="Constant">defg]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># type more text at the start</span>
   assume-console [
@@ -776,8 +776,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-wraps-cursor-after-inserting-characters-in-middle-of-line [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abcde]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abcde]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   assume-console [
     left-click <span class="Constant">1</span>, <span class="Constant">3</span>  <span class="Comment"># right before the wrap icon</span>
     type <span class="Constant">[f]</span>
@@ -804,7 +804,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   <span class="Constant">local-scope</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
   <span class="Comment"># create an editor containing two lines</span>
-  contents:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  contents:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">xyz]</span>
   <span class="Constant">1</span>:address:editor-data/<span class="Special">raw &lt;- </span>new-editor contents, screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   screen-should-contain [
@@ -831,8 +831,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-wraps-cursor-to-left-margin [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abcde]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">2/left</span>, <span class="Constant">7/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abcde]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">2/left</span>, <span class="Constant">7/right</span>
   assume-console [
     left-click <span class="Constant">1</span>, <span class="Constant">5</span>  <span class="Comment"># line is full; no wrap icon yet</span>
     type <span class="Constant">[01]</span>
@@ -867,8 +867,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-moves-cursor-down-after-inserting-newline [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   assume-console [
     type <span class="Constant">[0</span>
 <span class="Constant">1]</span>
@@ -973,8 +973,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-moves-cursor-down-after-inserting-newline-2 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">1/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">1/left</span>, <span class="Constant">10/right</span>
   assume-console [
     type <span class="Constant">[0</span>
 <span class="Constant">1]</span>
@@ -993,8 +993,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-clears-previous-line-completely-after-inserting-newline [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abcde]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abcde]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   assume-console [
     press enter
   ]
@@ -1020,10 +1020,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-inserts-indent-after-newline [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">10/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ab</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[ab</span>
 <span class="Constant">  cd</span>
 <span class="Constant">ef]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   <span class="Comment"># position cursor after 'cd' and hit 'newline'</span>
   assume-console [
     left-click <span class="Constant">2</span>, <span class="Constant">8</span>
@@ -1044,10 +1044,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-skips-indent-around-paste [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">10/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ab</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[ab</span>
 <span class="Constant">  cd</span>
 <span class="Constant">ef]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   <span class="Comment"># position cursor after 'cd' and hit 'newline' surrounded by paste markers</span>
   assume-console [
     left-click <span class="Constant">2</span>, <span class="Constant">8</span>
diff --git a/html/edit/003-shortcuts.mu.html b/html/edit/003-shortcuts.mu.html
index 61a2f538..ce053fd8 100644
--- a/html/edit/003-shortcuts.mu.html
+++ b/html/edit/003-shortcuts.mu.html
@@ -41,9 +41,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-inserts-two-spaces-on-tab [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
   <span class="Comment"># just one character in final line</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ab</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[ab</span>
 <span class="Constant">cd]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   assume-console [
     press tab
   ]
@@ -74,8 +74,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-handles-backspace-key [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   assume-console [
@@ -252,9 +252,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-clears-last-line-on-backspace [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
   <span class="Comment"># just one character in final line</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ab</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[ab</span>
 <span class="Constant">cd]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   assume-console [
     left-click <span class="Constant">2</span>, <span class="Constant">0</span>  <span class="Comment"># cursor at only character in final line</span>
     press backspace
@@ -279,9 +279,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-joins-and-wraps-lines-on-backspace [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
   <span class="Comment"># initialize editor with two long-ish but non-wrapping lines</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc def</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc def</span>
 <span class="Constant">ghi jkl]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   <span class="Comment"># position the cursor at the start of the second and hit backspace</span>
@@ -305,8 +305,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-wraps-long-lines-on-backspace [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
   <span class="Comment"># initialize editor in part of the screen with a long line</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc def ghij]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">8/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc def ghij]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">8/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># confirm that it wraps</span>
   screen-should-contain [
@@ -338,8 +338,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-handles-delete-key [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   assume-console [
@@ -427,8 +427,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-moves-cursor-right-with-key [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   assume-console [
@@ -524,9 +524,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-moves-cursor-to-next-line-with-right-arrow [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">d]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   <span class="Comment"># type right-arrow a few times to get to start of second line</span>
@@ -559,9 +559,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-moves-cursor-to-next-line-with-right-arrow-2 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">d]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">1/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">1/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   assume-console [
     press right-arrow
@@ -584,8 +584,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-moves-cursor-to-next-wrapped-line-with-right-arrow [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abcdef]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abcdef]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   assume-console [
@@ -614,8 +614,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-moves-cursor-to-next-wrapped-line-with-right-arrow-2 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
   <span class="Comment"># line just barely wrapping</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abcde]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abcde]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   <span class="Comment"># position cursor at last character before wrap and hit right-arrow</span>
@@ -650,8 +650,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-moves-cursor-to-next-wrapped-line-with-right-arrow-3 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abcdef]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">1/left</span>, <span class="Constant">6/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abcdef]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">1/left</span>, <span class="Constant">6/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   assume-console [
@@ -679,9 +679,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-moves-cursor-to-next-line-with-right-arrow-at-end-of-line [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">d]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   <span class="Comment"># move to end of line, press right-arrow, type a character</span>
@@ -710,8 +710,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-moves-cursor-left-with-key [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   assume-console [
@@ -753,9 +753,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-moves-cursor-to-previous-line-with-left-arrow-at-start-of-line [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
   <span class="Comment"># initialize editor with two lines</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">d]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   <span class="Comment"># position cursor at start of second line (so there's no previous newline)</span>
@@ -778,10 +778,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-moves-cursor-to-previous-line-with-left-arrow-at-start-of-line-2 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
   <span class="Comment"># initialize editor with three lines</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def</span>
 <span class="Constant">g]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   <span class="Comment"># position cursor further down (so there's a newline before the character at</span>
@@ -806,10 +806,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-moves-cursor-to-previous-line-with-left-arrow-at-start-of-line-3 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def</span>
 <span class="Constant">g]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   <span class="Comment"># position cursor at start of text, press left-arrow, then type a character</span>
@@ -835,10 +835,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-moves-cursor-to-previous-line-with-left-arrow-at-start-of-line-4 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
   <span class="Comment"># initialize editor with text containing an empty line</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 
 d]
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   <span class="Comment"># position cursor right after empty line</span>
@@ -863,8 +863,8 @@ d]
 <span class="muScenario">scenario</span> editor-moves-across-screen-lines-across-wrap-with-left-arrow [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
   <span class="Comment"># initialize editor with a wrapping line</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abcdef]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abcdef]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   screen-should-contain [
@@ -894,9 +894,9 @@ d]
 <span class="muScenario">scenario</span> editor-moves-across-screen-lines-to-wrapping-line-with-left-arrow [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
   <span class="Comment"># initialize editor with a wrapping line followed by a second line</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abcdef</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abcdef</span>
 <span class="Constant">g]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   screen-should-contain [
@@ -926,9 +926,9 @@ d]
 <span class="muScenario">scenario</span> editor-moves-across-screen-lines-to-non-wrapping-line-with-left-arrow [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
   <span class="Comment"># initialize editor with a line on the verge of wrapping, followed by a second line</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abcd</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abcd</span>
 <span class="Constant">e]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   screen-should-contain [
@@ -961,9 +961,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-moves-to-previous-line-with-up-arrow [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   assume-console [
@@ -1077,9 +1077,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-adjusts-column-at-previous-line [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ab</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[ab</span>
 <span class="Constant">def]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   assume-console [
@@ -1113,9 +1113,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-adjusts-column-at-empty-line [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new [
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new [
 <span class="muRecipe">def</span>]
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   assume-console [
@@ -1150,10 +1150,10 @@ d]
 <span class="muScenario">scenario</span> editor-moves-to-previous-line-from-left-margin [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
   <span class="Comment"># start out with three lines</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def</span>
 <span class="Constant">ghi]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   <span class="Comment"># click on the third line and hit up-arrow, so you end up just after a newline</span>
@@ -1190,9 +1190,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-moves-to-next-line-with-down-arrow [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   <span class="Comment"># cursor starts out at (1, 0)</span>
@@ -1295,9 +1295,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-adjusts-column-at-next-line [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">de]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   assume-console [
@@ -1333,9 +1333,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-moves-to-start-of-line-with-ctrl-a [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
 <span class="Constant">456]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   <span class="Comment"># start on second line, press ctrl-a</span>
@@ -1408,9 +1408,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-moves-to-start-of-line-with-ctrl-a-2 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
 <span class="Constant">456]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   <span class="Comment"># start on first line (no newline before), press ctrl-a</span>
@@ -1433,9 +1433,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-moves-to-start-of-line-with-home [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
 <span class="Constant">456]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span class="Constant">  $clear-trace</span>
   <span class="Comment"># start on second line, press 'home'</span>
   assume-console [
@@ -1457,9 +1457,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-moves-to-start-of-line-with-home-2 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
 <span class="Constant">456]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   <span class="Comment"># start on first line (no newline before), press 'home'</span>
@@ -1484,9 +1484,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-moves-to-end-of-line-with-ctrl-e [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
 <span class="Constant">456]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   <span class="Comment"># start on first line, press ctrl-e</span>
@@ -1576,9 +1576,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-moves-to-end-of-line-with-ctrl-e-2 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
 <span class="Constant">456]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   <span class="Comment"># start on second line (no newline after), press ctrl-e</span>
@@ -1601,9 +1601,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-moves-to-end-of-line-with-end [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
 <span class="Constant">456]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   <span class="Comment"># start on first line, press 'end'</span>
@@ -1626,9 +1626,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-moves-to-end-of-line-with-end-2 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
 <span class="Constant">456]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   <span class="Comment"># start on second line (no newline after), press 'end'</span>
@@ -1653,9 +1653,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-deletes-to-start-of-line-with-ctrl-u [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
 <span class="Constant">456]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   <span class="Comment"># start on second line, press ctrl-u</span>
   assume-console [
     left-click <span class="Constant">2</span>, <span class="Constant">2</span>
@@ -1716,9 +1716,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-deletes-to-start-of-line-with-ctrl-u-2 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
 <span class="Constant">456]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   <span class="Comment"># start on first line (no newline before), press ctrl-u</span>
   assume-console [
     left-click <span class="Constant">1</span>, <span class="Constant">2</span>
@@ -1739,9 +1739,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-deletes-to-start-of-line-with-ctrl-u-3 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
 <span class="Constant">456]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   <span class="Comment"># start past end of line, press ctrl-u</span>
   assume-console [
     left-click <span class="Constant">1</span>, <span class="Constant">3</span>
@@ -1762,9 +1762,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-deletes-to-start-of-final-line-with-ctrl-u [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
 <span class="Constant">456]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   <span class="Comment"># start past end of final line, press ctrl-u</span>
   assume-console [
     left-click <span class="Constant">2</span>, <span class="Constant">3</span>
@@ -1787,9 +1787,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-deletes-to-end-of-line-with-ctrl-k [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
 <span class="Constant">456]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   <span class="Comment"># start on first line, press ctrl-k</span>
   assume-console [
     left-click <span class="Constant">1</span>, <span class="Constant">1</span>
@@ -1842,9 +1842,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-deletes-to-end-of-line-with-ctrl-k-2 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
 <span class="Constant">456]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   <span class="Comment"># start on second line (no newline after), press ctrl-k</span>
   assume-console [
     left-click <span class="Constant">2</span>, <span class="Constant">1</span>
@@ -1865,9 +1865,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-deletes-to-end-of-line-with-ctrl-k-3 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
 <span class="Constant">456]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   <span class="Comment"># start at end of line</span>
   assume-console [
     left-click <span class="Constant">1</span>, <span class="Constant">2</span>
@@ -1888,9 +1888,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-deletes-to-end-of-line-with-ctrl-k-4 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
 <span class="Constant">456]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   <span class="Comment"># start past end of line</span>
   assume-console [
     left-click <span class="Constant">1</span>, <span class="Constant">3</span>
@@ -1911,9 +1911,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-deletes-to-end-of-line-with-ctrl-k-5 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
 <span class="Constant">456]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   <span class="Comment"># start at end of text</span>
   assume-console [
     left-click <span class="Constant">2</span>, <span class="Constant">2</span>
@@ -1934,9 +1934,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-deletes-to-end-of-line-with-ctrl-k-6 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[123</span>
 <span class="Constant">456]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   <span class="Comment"># start past end of text</span>
   assume-console [
     left-click <span class="Constant">2</span>, <span class="Constant">3</span>
@@ -1961,11 +1961,11 @@ d]
   <span class="Comment"># screen has 1 line for menu + 3 lines</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">4/height</span>
   <span class="Comment"># initialize editor with &gt;3 lines</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">b</span>
 <span class="Constant">c</span>
 <span class="Constant">d]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   screen-should-contain [
    <span class="Constant"> .          .</span>
    <span class="Constant"> .a         .</span>
@@ -2039,11 +2039,11 @@ d]
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">4/height</span>
   <span class="Comment"># initialize editor with a long, wrapped line and more than a screen of</span>
   <span class="Comment"># other lines</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abcdef</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abcdef</span>
 <span class="Constant">g</span>
 <span class="Constant">h</span>
 <span class="Constant">i]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   screen-should-contain [
    <span class="Constant"> .          .</span>
    <span class="Constant"> .abcd↩     .</span>
@@ -2071,11 +2071,11 @@ d]
   <span class="Comment"># screen has 1 line for menu + 3 lines</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">4/height</span>
   <span class="Comment"># editor starts with a long line wrapping twice</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abcdefghij</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abcdefghij</span>
 <span class="Constant">k</span>
 <span class="Constant">l</span>
 <span class="Constant">m]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   <span class="Comment"># position cursor at last line, then try to move further down</span>
   assume-console [
     left-click <span class="Constant">3</span>, <span class="Constant">0</span>
@@ -2111,10 +2111,10 @@ d]
   <span class="Comment"># screen has 1 line for menu + 3 lines</span>
   assume-screen <span class="Constant">5/width</span>, <span class="Constant">4/height</span>
   <span class="Comment"># editor contains a long line in the third line</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">b</span>
 <span class="Constant">cdef]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   <span class="Comment"># position cursor at end, type a character</span>
   assume-console [
     left-click <span class="Constant">3</span>, <span class="Constant">4</span>
@@ -2141,10 +2141,10 @@ d]
 <span class="muScenario">scenario</span> editor-scrolls-down-on-newline [
   assume-screen <span class="Constant">5/width</span>, <span class="Constant">4/height</span>
   <span class="Comment"># position cursor after last line and type newline</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">b</span>
 <span class="Constant">c]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   assume-console [
     left-click <span class="Constant">3</span>, <span class="Constant">4</span>
     type [
@@ -2172,10 +2172,10 @@ d]
   <span class="Comment"># screen has 1 line for menu + 3 lines</span>
   assume-screen <span class="Constant">5/width</span>, <span class="Constant">4/height</span>
   <span class="Comment"># editor contains a wrapped line</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">b</span>
 <span class="Constant">cdefgh]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   <span class="Comment"># position cursor at end of screen and try to move right</span>
   assume-console [
     left-click <span class="Constant">3</span>, <span class="Constant">3</span>
@@ -2203,11 +2203,11 @@ d]
   <span class="Comment"># screen has 1 line for menu + 3 lines</span>
   assume-screen <span class="Constant">5/width</span>, <span class="Constant">4/height</span>
   <span class="Comment"># editor contains more lines than can fit on screen</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">b</span>
 <span class="Constant">c</span>
 <span class="Constant">d]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   <span class="Comment"># position cursor at end of screen and try to move right</span>
   assume-console [
     left-click <span class="Constant">3</span>, <span class="Constant">3</span>
@@ -2233,9 +2233,9 @@ d]
 
 <span class="muScenario">scenario</span> editor-scrolls-at-end-on-down-arrow [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">de]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
 <span class="Constant">  $clear-trace</span>
   <span class="Comment"># try to move down past end of text</span>
@@ -2300,14 +2300,14 @@ d]
   <span class="Comment"># screen has 1 line for menu + 3 lines</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">4/height</span>
   <span class="Comment"># initialize editor with a few pages of lines</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">b</span>
 <span class="Constant">c</span>
 <span class="Constant">d</span>
 <span class="Constant">e</span>
 <span class="Constant">f</span>
 <span class="Constant">g]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   <span class="Comment"># scroll down one page and one line</span>
   assume-console [
     press page-down
@@ -2332,11 +2332,11 @@ d]
   <span class="Comment"># screen has 1 line for menu + 3 lines</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">4/height</span>
   <span class="Comment"># initialize editor with &gt;3 lines</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">b</span>
 <span class="Constant">c</span>
 <span class="Constant">d]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   screen-should-contain [
    <span class="Constant"> .          .</span>
    <span class="Constant"> .a         .</span>
@@ -2420,11 +2420,11 @@ d]
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">4/height</span>
   <span class="Comment"># initialize editor with a long, wrapped line and more than a screen of</span>
   <span class="Comment"># other lines</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abcdef</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abcdef</span>
 <span class="Constant">g</span>
 <span class="Constant">h</span>
 <span class="Constant">i]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   screen-should-contain [
    <span class="Constant"> .          .</span>
    <span class="Constant"> .abcd↩     .</span>
@@ -2464,11 +2464,11 @@ d]
   <span class="Comment"># screen has 1 line for menu + 4 lines</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
   <span class="Comment"># editor starts with a long line wrapping twice, occupying 3 of the 4 lines</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abcdefghij</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abcdefghij</span>
 <span class="Constant">k</span>
 <span class="Constant">l</span>
 <span class="Constant">m]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   <span class="Comment"># position cursor at top of second page</span>
   assume-console [
     press page-down
@@ -2537,11 +2537,11 @@ d]
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">4/height</span>
   <span class="Comment"># initialize editor with a long, wrapped line and more than a screen of</span>
   <span class="Comment"># other lines</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abcdef</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abcdef</span>
 <span class="Constant">g</span>
 <span class="Constant">h</span>
 <span class="Constant">i]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">6/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">6/right</span>
   screen-should-contain [
    <span class="Constant"> .          .</span>
    <span class="Constant"> .abcde↩    .</span>
@@ -2581,13 +2581,13 @@ d]
 <span class="muScenario">scenario</span> editor-scrolls-up-past-wrapped-line-using-arrow-keys-4 [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">4/height</span>
   <span class="Comment"># initialize editor with some lines around an empty line</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">b</span>
 
 c
 d
 e]
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">6/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">6/right</span>
   assume-console [
     press page-down
   ]
@@ -2630,12 +2630,12 @@ e]
   <span class="Comment"># screen has 1 line for menu + 3 lines</span>
   assume-screen <span class="Constant">5/width</span>, <span class="Constant">4/height</span>
   <span class="Comment"># editor contains &gt;3 lines</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">b</span>
 <span class="Constant">c</span>
 <span class="Constant">d</span>
 <span class="Constant">e]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   <span class="Comment"># position cursor at top of second page</span>
   assume-console [
     press page-down
@@ -2675,11 +2675,11 @@ e]
   <span class="Comment"># screen has 1 line for menu + 3 lines</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">4/height</span>
   <span class="Comment"># initialize editor with &gt;3 lines</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">b</span>
 <span class="Constant">c</span>
 <span class="Constant">d]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   screen-should-contain [
    <span class="Constant"> .          .</span>
    <span class="Constant"> .a         .</span>
@@ -2723,11 +2723,11 @@ e]
 
 <span class="muScenario">scenario</span> editor-can-scroll [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">4/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">b</span>
 <span class="Constant">c</span>
 <span class="Constant">d]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   screen-should-contain [
    <span class="Constant"> .          .</span>
    <span class="Constant"> .a         .</span>
@@ -2810,9 +2810,9 @@ e]
 
 <span class="muScenario">scenario</span> editor-does-not-scroll-past-end [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">4/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">b]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   screen-should-contain [
    <span class="Constant"> .          .</span>
@@ -2840,11 +2840,11 @@ e]
   <span class="Comment"># screen has 1 line for menu + 3 lines for text</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">4/height</span>
   <span class="Comment"># editor contains a long last line</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">b</span>
 <span class="Constant">cdefgh]</span>
   <span class="Comment"># editor screen triggers wrap of last line</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">4/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">4/right</span>
   <span class="Comment"># some part of last line is not displayed</span>
   screen-should-contain [
    <span class="Constant"> .          .</span>
@@ -2873,9 +2873,9 @@ e]
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">4/height</span>
   <span class="Comment"># editor contains a very long line that occupies last two lines of screen</span>
   <span class="Comment"># and still has something left over</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">bcdefgh]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">4/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">4/right</span>
   <span class="Comment"># some part of last line is not displayed</span>
   screen-should-contain [
    <span class="Constant"> .          .</span>
@@ -2903,11 +2903,11 @@ e]
 
 <span class="muScenario">scenario</span> editor-can-scroll-up [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">4/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">b</span>
 <span class="Constant">c</span>
 <span class="Constant">d]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   screen-should-contain [
    <span class="Constant"> .          .</span>
    <span class="Constant"> .a         .</span>
@@ -2999,7 +2999,7 @@ e]
   <span class="Comment"># screen has 1 line for menu + 3 lines</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">4/height</span>
   <span class="Comment"># initialize editor with 8 lines</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">b</span>
 <span class="Constant">c</span>
 <span class="Constant">d</span>
@@ -3007,7 +3007,7 @@ e]
 <span class="Constant">f</span>
 <span class="Constant">g</span>
 <span class="Constant">h]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   screen-should-contain [
    <span class="Constant"> .          .</span>
    <span class="Constant"> .a         .</span>
@@ -3063,7 +3063,7 @@ e]
   <span class="Comment"># screen has 1 line for menu + 5 lines for text</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">6/height</span>
   <span class="Comment"># editor contains a long line in the first page</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">b</span>
 <span class="Constant">cdefgh</span>
 <span class="Constant">i</span>
@@ -3074,7 +3074,7 @@ e]
 <span class="Constant">n</span>
 <span class="Constant">o]</span>
   <span class="Comment"># editor screen triggers wrap of last line</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">4/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">4/right</span>
   <span class="Comment"># some part of last line is not displayed</span>
   screen-should-contain [
    <span class="Constant"> .          .</span>
@@ -3125,9 +3125,9 @@ e]
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">4/height</span>
   <span class="Comment"># editor contains a very long line that occupies last two lines of screen</span>
   <span class="Comment"># and still has something left over</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">bcdefgh]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">4/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">4/right</span>
   <span class="Comment"># some part of last line is not displayed</span>
   screen-should-contain [
    <span class="Constant"> .          .</span>
@@ -3168,7 +3168,7 @@ e]
 <span class="muScenario">scenario</span> editor-can-scroll-up-past-nonempty-lines [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">4/height</span>
   <span class="Comment"># text with empty line in second screen</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[axx</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[axx</span>
 <span class="Constant">bxx</span>
 <span class="Constant">cxx</span>
 <span class="Constant">dxx</span>
@@ -3177,7 +3177,7 @@ e]
 <span class="Constant">gxx</span>
 <span class="Constant">hxx</span>
 <span class="Constant">]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">4/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">4/right</span>
   screen-should-contain [
    <span class="Constant"> .          .</span>
    <span class="Constant"> .axx       .</span>
@@ -3226,7 +3226,7 @@ e]
 <span class="muScenario">scenario</span> editor-can-scroll-up-past-empty-lines [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">4/height</span>
   <span class="Comment"># text with empty line in second screen</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[axy</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[axy</span>
 <span class="Constant">bxy</span>
 <span class="Constant">cxy</span>
 
@@ -3235,7 +3235,7 @@ exy
 fxy
 gxy
 ]
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">4/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">4/right</span>
   screen-should-contain [
    <span class="Constant"> .          .</span>
    <span class="Constant"> .axy       .</span>
diff --git a/html/edit/004-programming-environment.mu.html b/html/edit/004-programming-environment.mu.html
index a640fa59..24b66e0d 100644
--- a/html/edit/004-programming-environment.mu.html
+++ b/html/edit/004-programming-environment.mu.html
@@ -42,8 +42,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muRecipe">def!</span> main [
   <span class="Constant">local-scope</span>
   open-console
-  initial-recipe:address:array:character<span class="Special"> &lt;- </span>restore <span class="Constant">[recipes.mu]</span>
-  initial-sandbox:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  initial-recipe:text<span class="Special"> &lt;- </span>restore <span class="Constant">[recipes.mu]</span>
+  initial-sandbox:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
   hide-screen <span class="Constant">0/screen</span>
   env:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment <span class="Constant">0/screen</span>, initial-recipe, initial-sandbox
   render-all <span class="Constant">0/screen</span>, env, render
@@ -57,7 +57,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   sandbox-in-focus?:boolean  <span class="Comment"># false =&gt; cursor in recipes; true =&gt; cursor in current-sandbox</span>
 ]
 
-<span class="muRecipe">def</span> new-programming-environment screen:address:screen, initial-recipe-contents:address:array:character, initial-sandbox-contents:address:array:character<span class="muRecipe"> -&gt; </span>result:address:programming-environment-data, screen:address:screen [
+<span class="muRecipe">def</span> new-programming-environment screen:address:screen, initial-recipe-contents:text, initial-sandbox-contents:text<span class="muRecipe"> -&gt; </span>result:address:programming-environment-data, screen:address:screen [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
   width:number<span class="Special"> &lt;- </span>screen-width screen
@@ -332,9 +332,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">30/width</span>, <span class="Constant">5/height</span>
   <span class="Comment"># initialize both halves of screen</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[def]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[def]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   <span class="Comment"># focus on both sides</span>
   assume-console [
     left-click <span class="Constant">1</span>, <span class="Constant">1</span>
@@ -358,9 +358,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">30/width</span>, <span class="Constant">5/height</span>
   <span class="Comment"># initialize both halves of screen</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[def]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[def]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   render-all screen, <span class="Constant">3</span>:address:programming-environment-data, render
   <span class="Comment"># type one letter in each of them</span>
   assume-console [
@@ -403,9 +403,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">60/width</span>, <span class="Constant">10/height</span>
   run [
-    <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
-    <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[def]</span>
-    <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+    <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
+    <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[def]</span>
+    <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
     render-all screen, <span class="Constant">3</span>:address:programming-environment-data, render
   ]
   <span class="Comment"># divider isn't messed up</span>
@@ -421,9 +421,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-in-focus-keeps-cursor [
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">30/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[def]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[def]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   render-all screen, <span class="Constant">3</span>:address:programming-environment-data, render
   <span class="Comment"># initialize programming environment and highlight cursor</span>
   assume-console <span class="Constant">[]</span>
@@ -461,10 +461,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="CommentedCode">#?   trace-until 100/app  # trace too long</span>
   assume-screen <span class="Constant">30/width</span>, <span class="Constant">5/height</span>
   <span class="Comment"># initialize sandbox side with two lines</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   render-all screen, <span class="Constant">3</span>:address:programming-environment-data, render
   screen-should-contain [
    <span class="Constant"> .           run (F4)           .</span>
@@ -576,7 +576,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 ]
 
 <span class="Comment"># like 'render' for texts, but with colorization for comments like in the editor</span>
-<span class="muRecipe">def</span> render-code screen:address:screen, s:address:array:character, left:number, right:number, row:number<span class="muRecipe"> -&gt; </span>row:number, screen:address:screen [
+<span class="muRecipe">def</span> render-code screen:address:screen, s:text, left:number, right:number, row:number<span class="muRecipe"> -&gt; </span>row:number, screen:address:screen [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
   <span class="muControl">return-unless</span> s
diff --git a/html/edit/005-sandbox.mu.html b/html/edit/005-sandbox.mu.html
index 7c4fe9e8..47a291e5 100644
--- a/html/edit/005-sandbox.mu.html
+++ b/html/edit/005-sandbox.mu.html
@@ -45,8 +45,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muRecipe">def!</span> main [
   <span class="Constant">local-scope</span>
   open-console
-  initial-recipe:address:array:character<span class="Special"> &lt;- </span>restore <span class="Constant">[recipes.mu]</span>
-  initial-sandbox:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  initial-recipe:text<span class="Special"> &lt;- </span>restore <span class="Constant">[recipes.mu]</span>
+  initial-sandbox:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
   hide-screen <span class="Constant">0/screen</span>
   env:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment <span class="Constant">0/screen</span>, initial-recipe, initial-sandbox
   env<span class="Special"> &lt;- </span>restore-sandboxes env
@@ -66,8 +66,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 ]
 
 <span class="muData">container</span> sandbox-data [
-  data:address:array:character
-  response:address:array:character
+  data:text
+  response:text
   <span class="Comment"># coordinates to track clicks</span>
   <span class="Comment"># constraint: will be 0 for sandboxes at positions before env.render-from</span>
   starting-row-on-screen:number
@@ -80,10 +80,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
   <span class="Comment"># recipe editor is empty</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
   <span class="Comment"># sandbox editor contains an instruction without storing outputs</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[divide-with-remainder 11, 3]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[divide-with-remainder 11, 3]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   <span class="Comment"># run the code in the editors</span>
   assume-console [
     press F4
@@ -186,7 +186,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="Constant">  &lt;run-sandboxes-begin&gt;</span>
   current-sandbox:address:editor-data<span class="Special"> &lt;- </span>get *env, <span class="Constant">current-sandbox:offset</span>
   <span class="Delimiter">{</span>
-    sandbox-contents:address:array:character<span class="Special"> &lt;- </span>editor-contents current-sandbox
+    sandbox-contents:text<span class="Special"> &lt;- </span>editor-contents current-sandbox
     <span class="muControl">break-unless</span> sandbox-contents
     <span class="Comment"># if contents exist, first save them</span>
     <span class="Comment"># run them and turn them into a new sandbox-data</span>
@@ -226,7 +226,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
   recipes:address:editor-data<span class="Special"> &lt;- </span>get *env, <span class="Constant">recipes:offset</span>
-  in:address:array:character<span class="Special"> &lt;- </span>editor-contents recipes
+  in:text<span class="Special"> &lt;- </span>editor-contents recipes
   save <span class="Constant">[recipes.mu]</span>, in  <span class="Comment"># newlayer: persistence</span>
   reload in
   errors-found?<span class="Special"> &lt;- </span>copy <span class="Constant">0/false</span>
@@ -236,13 +236,13 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muRecipe">def!</span> update-sandbox sandbox:address:sandbox-data, env:address:programming-environment-data, idx:number<span class="muRecipe"> -&gt; </span>sandbox:address:sandbox-data, env:address:programming-environment-data [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
-  data:address:array:character<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">data:offset</span>
-  response:address:array:character, _, fake-screen:address:screen<span class="Special"> &lt;- </span>run-sandboxed data
+  data:text<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">data:offset</span>
+  response:text, _, fake-screen:address:screen<span class="Special"> &lt;- </span>run-sandboxed data
   *sandbox<span class="Special"> &lt;- </span>put *sandbox, <span class="Constant">response:offset</span>, response
   *sandbox<span class="Special"> &lt;- </span>put *sandbox, <span class="Constant">screen:offset</span>, fake-screen
 ]
 
-<span class="muRecipe">def</span> update-status screen:address:screen, msg:address:array:character, color:number<span class="muRecipe"> -&gt; </span>screen:address:screen [
+<span class="muRecipe">def</span> update-status screen:address:screen, msg:text, color:number<span class="muRecipe"> -&gt; </span>screen:address:screen [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
   screen<span class="Special"> &lt;- </span>move-cursor screen, <span class="Constant">0</span>, <span class="Constant">2</span>
@@ -259,8 +259,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   idx:number<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
   <span class="Delimiter">{</span>
     <span class="muControl">break-unless</span> curr
-    data:address:array:character<span class="Special"> &lt;- </span>get *curr, <span class="Constant">data:offset</span>
-    filename:address:array:character<span class="Special"> &lt;- </span>to-text idx
+    data:text<span class="Special"> &lt;- </span>get *curr, <span class="Constant">data:offset</span>
+    filename:text<span class="Special"> &lt;- </span>to-text idx
     save filename, data
 <span class="Constant">    &lt;end-save-sandbox&gt;</span>
     idx<span class="Special"> &lt;- </span>add idx, <span class="Constant">1</span>
@@ -312,11 +312,11 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
     <span class="Comment"># render sandbox contents</span>
     row<span class="Special"> &lt;- </span>add row, <span class="Constant">1</span>
     screen<span class="Special"> &lt;- </span>move-cursor screen, row, left
-    sandbox-data:address:array:character<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">data:offset</span>
+    sandbox-data:text<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">data:offset</span>
     row, screen<span class="Special"> &lt;- </span>render-code screen, sandbox-data, left, right, row
     *sandbox<span class="Special"> &lt;- </span>put *sandbox, <span class="Constant">code-ending-row-on-screen:offset</span>, row
     <span class="Comment"># render sandbox warnings, screen or response, in that order</span>
-    sandbox-response:address:array:character<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">response:offset</span>
+    sandbox-response:text<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">response:offset</span>
 <span class="Constant">    &lt;render-sandbox-results&gt;</span>
     <span class="Delimiter">{</span>
       sandbox-screen:address:screen<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">screen:offset</span>
@@ -390,7 +390,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="Comment"># print a text 's' to 'editor' in 'color' starting at 'row'</span>
 <span class="Comment"># clear rest of last line, move cursor to next line</span>
-<span class="muRecipe">def</span> render-text screen:address:screen, s:address:array:character, left:number, right:number, color:number, row:number<span class="muRecipe"> -&gt; </span>row:number, screen:address:screen [
+<span class="muRecipe">def</span> render-text screen:address:screen, s:text, left:number, right:number, color:number, row:number<span class="muRecipe"> -&gt; </span>row:number, screen:address:screen [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
   <span class="muControl">return-unless</span> s
@@ -459,8 +459,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   curr:address:sandbox-data<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
   prev:address:sandbox-data<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
   <span class="Delimiter">{</span>
-    filename:address:array:character<span class="Special"> &lt;- </span>to-text idx
-    contents:address:array:character<span class="Special"> &lt;- </span>restore filename
+    filename:text<span class="Special"> &lt;- </span>to-text idx
+    contents:text<span class="Special"> &lt;- </span>restore filename
     <span class="muControl">break-unless</span> contents  <span class="Comment"># stop at first error; assuming file didn't exist</span>
                            <span class="Comment"># todo: handle empty sandbox</span>
     <span class="Comment"># create new sandbox for file</span>
@@ -554,15 +554,15 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">12/height</span>
   <span class="Comment"># define a recipe (no indent for the 'add' line below so column numbers are more obvious)</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
 <span class="Constant">recipe foo [</span>
 <span class="Constant">local-scope</span>
 <span class="Constant">z:number &lt;- add 2, 2</span>
 <span class="Constant">reply z</span>
 <span class="Constant">]</span>]
   <span class="Comment"># sandbox editor contains an instruction without storing outputs</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   <span class="Comment"># run the code in the editors</span>
   assume-console [
     press F4
@@ -607,10 +607,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">20/height</span>
   <span class="Comment"># left editor is empty</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
   <span class="Comment"># right editor contains an instruction</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[print-integer screen, 4]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[print-integer screen, 4]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   <span class="Comment"># run the code in the editor</span>
   assume-console [
     press F4
@@ -636,7 +636,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   ]
 ]
 
-<span class="muRecipe">def</span> editor-contents editor:address:editor-data<span class="muRecipe"> -&gt; </span>result:address:array:character [
+<span class="muRecipe">def</span> editor-contents editor:address:editor-data<span class="muRecipe"> -&gt; </span>result:text [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
   buf:address:buffer<span class="Special"> &lt;- </span>new-buffer <span class="Constant">80</span>
@@ -657,16 +657,16 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muScenario">scenario</span> editor-provides-edited-contents [
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   assume-console [
     left-click <span class="Constant">1</span>, <span class="Constant">2</span>
     type <span class="Constant">[def]</span>
   ]
   run [
     editor-event-loop screen:address:screen, console:address:console, <span class="Constant">2</span>:address:editor-data
-    <span class="Constant">3</span>:address:array:character<span class="Special"> &lt;- </span>editor-contents <span class="Constant">2</span>:address:editor-data
-    <span class="Constant">4</span>:array:character<span class="Special"> &lt;- </span>copy *<span class="Constant">3</span>:address:array:character
+    <span class="Constant">3</span>:text<span class="Special"> &lt;- </span>editor-contents <span class="Constant">2</span>:address:editor-data
+    <span class="Constant">4</span>:array:character<span class="Special"> &lt;- </span>copy *<span class="Constant">3</span>:text
   ]
   memory-should-contain [
     <span class="Constant">4</span>:array:character<span class="Special"> &lt;- </span><span class="Constant">[abdefc]</span>
@@ -833,9 +833,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># initialize sandbox side</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[add 2, 2]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[add 2, 2]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   render-all screen, <span class="Constant">3</span>:address:programming-environment-data, render
   assume-console [
     <span class="Comment"># create a sandbox</span>
@@ -966,11 +966,11 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># initialize sandbox side and create a sandbox</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
 <span class="Constant">]</span>
   <span class="Comment"># create a sandbox</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[add 2, 2]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[add 2, 2]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   render-all screen, <span class="Constant">3</span>:address:programming-environment-data, render
   assume-console [
     press F4
@@ -999,9 +999,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># initialize environment</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   render-all screen, <span class="Constant">3</span>:address:programming-environment-data, render
   <span class="Comment"># create 2 sandboxes</span>
   assume-console [
@@ -1151,9 +1151,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># initialize environment</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   render-all screen, <span class="Constant">3</span>:address:programming-environment-data, render
   <span class="Comment"># create a sandbox</span>
   assume-console [
diff --git a/html/edit/006-sandbox-copy.mu.html b/html/edit/006-sandbox-copy.mu.html
index ccf5d361..fe86e811 100644
--- a/html/edit/006-sandbox-copy.mu.html
+++ b/html/edit/006-sandbox-copy.mu.html
@@ -39,16 +39,16 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># basic recipe</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
 <span class="Constant">recipe foo [</span>
 <span class="Constant">  reply 4</span>
 <span class="Constant">]</span>]
   <span class="Comment"># run it</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
   assume-console [
     press F4
   ]
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   event-loop screen:address:screen, console:address:console, <span class="Constant">3</span>:address:programming-environment-data
   screen-should-contain [
    <span class="Constant"> .                                                                                 run (F4)           .</span>
@@ -101,16 +101,16 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># basic recipe</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
 <span class="Constant">recipe foo [</span>
 <span class="Constant">  reply 4</span>
 <span class="Constant">]</span>]
   <span class="Comment"># run it</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
   assume-console [
     press F4
   ]
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   event-loop screen:address:screen, console:address:console, <span class="Constant">3</span>:address:programming-environment-data
   screen-should-contain [
    <span class="Constant"> .                                                                                 run (F4)           .</span>
@@ -201,7 +201,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   sandbox:address:sandbox-data<span class="Special"> &lt;- </span>find-sandbox env, click-row
   <span class="muControl">return-unless</span> sandbox, <span class="Constant">0/false</span>
   clicked-on-copy-button?<span class="Special"> &lt;- </span>copy <span class="Constant">1/true</span>
-  text:address:array:character<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">data:offset</span>
+  text:text<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">data:offset</span>
   current-sandbox:address:editor-data<span class="Special"> &lt;- </span>get *env, <span class="Constant">current-sandbox:offset</span>
   current-sandbox<span class="Special"> &lt;- </span>insert-text current-sandbox, text
   <span class="Comment"># reset scroll</span>
@@ -258,16 +258,16 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># basic recipe</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
 <span class="Constant">recipe foo [</span>
 <span class="Constant">  reply 4</span>
 <span class="Constant">]</span>]
   <span class="Comment"># run it</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
   assume-console [
     press F4
   ]
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   event-loop screen:address:screen, console:address:console, <span class="Constant">3</span>:address:programming-environment-data
   screen-should-contain [
    <span class="Constant"> .                                                                                 run (F4)           .</span>
diff --git a/html/edit/007-sandbox-delete.mu.html b/html/edit/007-sandbox-delete.mu.html
index f9f26d6f..94ca6a6c 100644
--- a/html/edit/007-sandbox-delete.mu.html
+++ b/html/edit/007-sandbox-delete.mu.html
@@ -37,9 +37,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> deleting-sandboxes [
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   <span class="Comment"># run a few commands</span>
   assume-console [
     left-click <span class="Constant">1</span>, <span class="Constant">80</span>
@@ -185,9 +185,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># initialize environment</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   render-all screen, <span class="Constant">3</span>:address:programming-environment-data, render
   <span class="Comment"># create 2 sandboxes and scroll to second</span>
   assume-console [
@@ -231,9 +231,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># initialize environment</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   render-all screen, <span class="Constant">3</span>:address:programming-environment-data, render
   <span class="Comment"># create 2 sandboxes and scroll to second</span>
   assume-console [
@@ -277,9 +277,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># initialize environment</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   render-all screen, <span class="Constant">3</span>:address:programming-environment-data, render
   <span class="Comment"># create 2 sandboxes and scroll to second</span>
   assume-console [
@@ -325,9 +325,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># initialize environment</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   render-all screen, <span class="Constant">3</span>:address:programming-environment-data, render
   <span class="Comment"># create 2 sandboxes</span>
   assume-console [
diff --git a/html/edit/008-sandbox-edit.mu.html b/html/edit/008-sandbox-edit.mu.html
index e79738c5..18926f44 100644
--- a/html/edit/008-sandbox-edit.mu.html
+++ b/html/edit/008-sandbox-edit.mu.html
@@ -38,16 +38,16 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># basic recipe</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
 <span class="Constant">recipe foo [</span>
 <span class="Constant">  reply 4</span>
 <span class="Constant">]</span>]
   <span class="Comment"># run it</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
   assume-console [
     press F4
   ]
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   event-loop screen:address:screen, console:address:console, <span class="Constant">3</span>:address:programming-environment-data
   screen-should-contain [
    <span class="Constant"> .                                                                                 run (F4)           .</span>
@@ -98,16 +98,16 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># basic recipe</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
 <span class="Constant">recipe foo [</span>
 <span class="Constant">  reply 4</span>
 <span class="Constant">]</span>]
   <span class="Comment"># run it</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
   assume-console [
     press F4
   ]
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   event-loop screen:address:screen, console:address:console, <span class="Constant">3</span>:address:programming-environment-data
   screen-should-contain [
    <span class="Constant"> .                                                                                 run (F4)           .</span>
@@ -197,7 +197,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   <span class="muControl">return-unless</span> sandbox, <span class="Constant">0/false</span>
   clicked-on-edit-button?<span class="Special"> &lt;- </span>copy <span class="Constant">1/true</span>
   <span class="Comment"># 'edit' button = 'copy' button + 'delete' button</span>
-  text:address:array:character<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">data:offset</span>
+  text:text<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">data:offset</span>
   current-sandbox:address:editor-data<span class="Special"> &lt;- </span>get *env, <span class="Constant">current-sandbox:offset</span>
   current-sandbox<span class="Special"> &lt;- </span>insert-text current-sandbox, text
   env<span class="Special"> &lt;- </span>delete-sandbox env, sandbox
@@ -211,10 +211,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">20/height</span>
   <span class="Comment"># left editor is empty</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
   <span class="Comment"># right editor contains an instruction</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[print-integer screen, 4]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[print-integer screen, 4]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   <span class="Comment"># run the sandbox</span>
   assume-console [
     press F4
@@ -255,9 +255,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># initialize environment</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   render-all screen, <span class="Constant">3</span>:address:programming-environment-data, render
   <span class="Comment"># create 2 sandboxes and scroll to second</span>
   assume-console [
@@ -303,9 +303,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># initialize environment</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   render-all screen, <span class="Constant">3</span>:address:programming-environment-data, render
   <span class="Comment"># create 2 sandboxes</span>
   assume-console [
diff --git a/html/edit/009-sandbox-test.mu.html b/html/edit/009-sandbox-test.mu.html
index eeb61f7f..1772865b 100644
--- a/html/edit/009-sandbox-test.mu.html
+++ b/html/edit/009-sandbox-test.mu.html
@@ -39,16 +39,16 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># basic recipe</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
 <span class="Constant">recipe foo [</span>
 <span class="Constant">  reply 4</span>
 <span class="Constant">]</span>]
   <span class="Comment"># run it</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
   assume-console [
     press F4
   ]
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   event-loop screen:address:screen, console:address:console, <span class="Constant">3</span>:address:programming-environment-data
   screen-should-contain [
    <span class="Constant"> .                                                                                 run (F4)           .</span>
@@ -122,13 +122,13 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="Comment"># this requires tracking a couple more things</span>
 <span class="muData">container</span> sandbox-data [
   response-starting-row-on-screen:number
-  expected-response:address:array:character
+  expected-response:text
 ]
 
 <span class="Comment"># include expected response when saving or restoring a sandbox</span>
 <span class="muRecipe">before</span> <span class="Constant">&lt;end-save-sandbox&gt;</span> [
   <span class="Delimiter">{</span>
-    expected-response:address:array:character<span class="Special"> &lt;- </span>get *curr, <span class="Constant">expected-response:offset</span>
+    expected-response:text<span class="Special"> &lt;- </span>get *curr, <span class="Constant">expected-response:offset</span>
     <span class="muControl">break-unless</span> expected-response
     filename<span class="Special"> &lt;- </span>append filename, <span class="Constant">[.out]</span>
     save filename, expected-response
@@ -202,7 +202,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muRecipe">def</span> toggle-expected-response sandbox:address:sandbox-data<span class="muRecipe"> -&gt; </span>sandbox:address:sandbox-data [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
-  expected-response:address:array:character<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">expected-response:offset</span>
+  expected-response:text<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">expected-response:offset</span>
   <span class="Delimiter">{</span>
     <span class="Comment"># if expected-response is set, reset</span>
     <span class="muControl">break-unless</span> expected-response
@@ -211,7 +211,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   <span class="Delimiter">{</span>
     <span class="Comment"># if not, set expected response to the current response</span>
     <span class="muControl">break-if</span> expected-response
-    response:address:array:character<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">response:offset</span>
+    response:text<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">response:offset</span>
     *sandbox<span class="Special"> &lt;- </span>put *sandbox, <span class="Constant">expected-response:offset</span>, response
   <span class="Delimiter">}</span>
 ]
@@ -221,7 +221,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   <span class="Delimiter">{</span>
     <span class="muControl">break-unless</span> sandbox-response
     *sandbox<span class="Special"> &lt;- </span>put *sandbox, <span class="Constant">response-starting-row-on-screen:offset</span>, row
-    expected-response:address:array:character<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">expected-response:offset</span>
+    expected-response:text<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">expected-response:offset</span>
     <span class="muControl">break-unless</span> expected-response  <span class="Comment"># fall-through to print in grey</span>
     response-is-expected?:boolean<span class="Special"> &lt;- </span>equal expected-response, sandbox-response
     <span class="Delimiter">{</span>
diff --git a/html/edit/010-sandbox-trace.mu.html b/html/edit/010-sandbox-trace.mu.html
index a5c77f15..3c4956b7 100644
--- a/html/edit/010-sandbox-trace.mu.html
+++ b/html/edit/010-sandbox-trace.mu.html
@@ -39,16 +39,16 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># basic recipe</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
 <span class="Constant">recipe foo [</span>
 <span class="Constant">  stash [abc]</span>
 ]]
   <span class="Comment"># run it</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
   assume-console [
     press F4
   ]
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   event-loop screen:address:screen, console:address:console, <span class="Constant">3</span>:address:programming-environment-data
   screen-should-contain [
    <span class="Constant"> .                                                                                 run (F4)           .</span>
@@ -115,17 +115,17 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># basic recipe</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
 <span class="Constant">recipe foo [</span>
 <span class="Constant">  stash [abc]</span>
   <span class="muControl">reply</span> <span class="Constant">4</span>
 ]]
   <span class="Comment"># run it</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
   assume-console [
     press F4
   ]
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   event-loop screen:address:screen, console:address:console, <span class="Constant">3</span>:address:programming-environment-data
   screen-should-contain [
    <span class="Constant"> .                                                                                 run (F4)           .</span>
@@ -162,14 +162,14 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> clicking-on-app-trace-does-nothing [
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
   <span class="Comment"># create and expand the trace</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[stash 123456789]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[stash 123456789]</span>
   assume-console [
     press F4
     left-click <span class="Constant">4</span>, <span class="Constant">51</span>
   ]
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   event-loop screen:address:screen, console:address:console, <span class="Constant">3</span>:address:programming-environment-data
   screen-should-contain [
    <span class="Constant"> .                                                                                 run (F4)           .</span>
@@ -204,7 +204,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 ]
 
 <span class="muData">container</span> sandbox-data [
-  trace:address:array:character
+  trace:text
   display-trace?:boolean
 ]
 
@@ -212,8 +212,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muRecipe">def!</span> update-sandbox sandbox:address:sandbox-data, env:address:programming-environment-data, idx:number<span class="muRecipe"> -&gt; </span>sandbox:address:sandbox-data, env:address:programming-environment-data [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
-  data:address:array:character<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">data:offset</span>
-  response:address:array:character, _, fake-screen:address:screen, trace:address:array:character<span class="Special"> &lt;- </span>run-sandboxed data
+  data:text<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">data:offset</span>
+  response:text, _, fake-screen:address:screen, trace:text<span class="Special"> &lt;- </span>run-sandboxed data
   *sandbox<span class="Special"> &lt;- </span>put *sandbox, <span class="Constant">response:offset</span>, response
   *sandbox<span class="Special"> &lt;- </span>put *sandbox, <span class="Constant">screen:offset</span>, fake-screen
   *sandbox<span class="Special"> &lt;- </span>put *sandbox, <span class="Constant">trace:offset</span>, trace
@@ -285,7 +285,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   <span class="Delimiter">{</span>
     display-trace?:boolean<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">display-trace?:offset</span>
     <span class="muControl">break-unless</span> display-trace?
-    sandbox-trace:address:array:character<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">trace:offset</span>
+    sandbox-trace:text<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">trace:offset</span>
     <span class="muControl">break-unless</span> sandbox-trace  <span class="Comment"># nothing to print; move on</span>
     row, screen<span class="Special"> &lt;- </span>render-text screen, sandbox-trace, left, right, <span class="Constant">245/grey</span>, row
   <span class="Delimiter">}</span>
diff --git a/html/edit/011-errors.mu.html b/html/edit/011-errors.mu.html
index b9f46f1b..6d0117bb 100644
--- a/html/edit/011-errors.mu.html
+++ b/html/edit/011-errors.mu.html
@@ -36,7 +36,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="SalientComment">## handling malformed programs</span>
 
 <span class="muData">container</span> programming-environment-data [
-  recipe-errors:address:array:character
+  recipe-errors:text
 ]
 
 <span class="Comment"># copy code from recipe editor, persist, load into mu, save any errors</span>
@@ -44,9 +44,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
   recipes:address:editor-data<span class="Special"> &lt;- </span>get *env, <span class="Constant">recipes:offset</span>
-  in:address:array:character<span class="Special"> &lt;- </span>editor-contents recipes
+  in:text<span class="Special"> &lt;- </span>editor-contents recipes
   save <span class="Constant">[recipes.mu]</span>, in
-  recipe-errors:address:array:character<span class="Special"> &lt;- </span>reload in
+  recipe-errors:text<span class="Special"> &lt;- </span>reload in
   *env<span class="Special"> &lt;- </span>put *env, <span class="Constant">recipe-errors:offset</span>, recipe-errors
   <span class="Comment"># if recipe editor has errors, stop</span>
   <span class="Delimiter">{</span>
@@ -60,7 +60,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muRecipe">before</span> <span class="Constant">&lt;render-components-end&gt;</span> [
   trace <span class="Constant">11</span>, <span class="Constant">[app]</span>, <span class="Constant">[render status]</span>
-  recipe-errors:address:array:character<span class="Special"> &lt;- </span>get *env, <span class="Constant">recipe-errors:offset</span>
+  recipe-errors:text<span class="Special"> &lt;- </span>get *env, <span class="Constant">recipe-errors:offset</span>
   <span class="Delimiter">{</span>
     <span class="muControl">break-unless</span> recipe-errors
     update-status screen, <span class="Constant">[errors found     ]</span>, <span class="Constant">1/red</span>
@@ -69,7 +69,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 
 <span class="muRecipe">before</span> <span class="Constant">&lt;render-recipe-components-end&gt;</span> [
   <span class="Delimiter">{</span>
-    recipe-errors:address:array:character<span class="Special"> &lt;- </span>get *env, <span class="Constant">recipe-errors:offset</span>
+    recipe-errors:text<span class="Special"> &lt;- </span>get *env, <span class="Constant">recipe-errors:offset</span>
     <span class="muControl">break-unless</span> recipe-errors
     row, screen<span class="Special"> &lt;- </span>render-text screen, recipe-errors, left, right, <span class="Constant">1/red</span>, row
   <span class="Delimiter">}</span>
@@ -102,21 +102,21 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
     error-index:number<span class="Special"> &lt;- </span>get *env, <span class="Constant">error-index:offset</span>
     sandboxes-completed-successfully?:boolean<span class="Special"> &lt;- </span>equal error-index, <span class="Constant">-1</span>
     <span class="muControl">break-if</span> sandboxes-completed-successfully?
-    error-index-text:address:array:character<span class="Special"> &lt;- </span>to-text error-index
-    status:address:array:character<span class="Special"> &lt;- </span>interpolate <span class="Constant">[errors found (_)    ]</span>, error-index-text
+    error-index-text:text<span class="Special"> &lt;- </span>to-text error-index
+    status:text<span class="Special"> &lt;- </span>interpolate <span class="Constant">[errors found (_)    ]</span>, error-index-text
     update-status screen, status, <span class="Constant">1/red</span>
   <span class="Delimiter">}</span>
 ]
 
 <span class="muData">container</span> sandbox-data [
-  errors:address:array:character
+  errors:text
 ]
 
 <span class="muRecipe">def!</span> update-sandbox sandbox:address:sandbox-data, env:address:programming-environment-data, idx:number<span class="muRecipe"> -&gt; </span>sandbox:address:sandbox-data, env:address:programming-environment-data [
   <span class="Constant">local-scope</span>
   <span class="Constant">load-ingredients</span>
-  data:address:array:character<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">data:offset</span>
-  response:address:array:character, errors:address:array:character, fake-screen:address:screen, trace:address:array:character, completed?:boolean<span class="Special"> &lt;- </span>run-sandboxed data
+  data:text<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">data:offset</span>
+  response:text, errors:text, fake-screen:address:screen, trace:text, completed?:boolean<span class="Special"> &lt;- </span>run-sandboxed data
   *sandbox<span class="Special"> &lt;- </span>put *sandbox, <span class="Constant">response:offset</span>, response
   *sandbox<span class="Special"> &lt;- </span>put *sandbox, <span class="Constant">errors:offset</span>, errors
   *sandbox<span class="Special"> &lt;- </span>put *sandbox, <span class="Constant">screen:offset</span>, fake-screen
@@ -140,7 +140,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="Comment"># make sure we render any trace</span>
 <span class="muRecipe">after</span> <span class="Constant">&lt;render-sandbox-trace-done&gt;</span> [
   <span class="Delimiter">{</span>
-    sandbox-errors:address:array:character<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">errors:offset</span>
+    sandbox-errors:text<span class="Special"> &lt;- </span>get *sandbox, <span class="Constant">errors:offset</span>
     <span class="muControl">break-unless</span> sandbox-errors
     *sandbox<span class="Special"> &lt;- </span>put *sandbox, <span class="Constant">response-starting-row-on-screen:offset</span>, <span class="Constant">0</span>  <span class="Comment"># no response</span>
     row, screen<span class="Special"> &lt;- </span>render-text screen, sandbox-errors, left, right, <span class="Constant">1/red</span>, row
@@ -152,12 +152,12 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> run-shows-errors-in-get [
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
 <span class="Constant">recipe foo [</span>
 <span class="Constant">  get 123:number, foo:offset</span>
 <span class="Constant">]</span>]
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   assume-console [
     press F4
   ]
@@ -192,9 +192,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> run-updates-status-with-first-erroneous-sandbox [
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   assume-console [
     left-click <span class="Constant">3</span>, <span class="Constant">80</span>
     <span class="Comment"># create invalid sandbox 1</span>
@@ -216,9 +216,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> run-updates-status-with-first-erroneous-sandbox-2 [
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   assume-console [
     left-click <span class="Constant">3</span>, <span class="Constant">80</span>
     <span class="Comment"># create invalid sandbox 2</span>
@@ -243,9 +243,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> run-hides-errors-from-past-sandboxes [
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[get foo, x:offset]</span>  <span class="Comment"># invalid</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[get foo, x:offset]</span>  <span class="Comment"># invalid</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   assume-console [
     press F4  <span class="Comment"># generate error</span>
   ]
@@ -278,14 +278,14 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
   <span class="Comment"># define a shape-shifting recipe with an error</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[recipe foo x:_elem -&gt; z:_elem [</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[recipe foo x:_elem -&gt; z:_elem [</span>
 <span class="Constant">local-scope</span>
 <span class="Constant">load-ingredients</span>
 <span class="Constant">y:address:number &lt;- copy 0</span>
 <span class="Constant">z &lt;- add x, y</span>
 <span class="Constant">]</span>]
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[foo 2]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[foo 2]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   assume-console [
     press F4
   ]
@@ -326,12 +326,12 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
   <span class="Comment"># overload a well-known shape-shifting recipe</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[recipe length l:address:list:_elem -&gt; n:number [</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[recipe length l:address:list:_elem -&gt; n:number [</span>
 <span class="Constant">]</span>]
   <span class="Comment"># call code that uses other variants of it, but not it itself</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[x:address:list:number &lt;- copy 0</span>
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[x:address:list:number &lt;- copy 0</span>
 <span class="Constant">to-text x]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   <span class="Comment"># run it once</span>
   assume-console [
     press F4
@@ -385,12 +385,12 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> run-shows-missing-type-errors [
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
 <span class="Constant">recipe foo [</span>
 <span class="Constant">  x &lt;- copy 0</span>
 <span class="Constant">]</span>]
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   assume-console [
     press F4
   ]
@@ -411,12 +411,12 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
   <span class="Comment"># recipe is incomplete (unbalanced '[')</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
 <span class="Constant">recipe foo \\[</span>
 <span class="Constant">  x &lt;- copy 0</span>
 <span class="Constant">]</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   assume-console [
     press F4
   ]
@@ -438,14 +438,14 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> run-shows-get-on-non-container-errors [
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
 <span class="Constant">recipe foo [</span>
 <span class="Constant">  local-scope</span>
 <span class="Constant">  x:address:point &lt;- new point:type</span>
 <span class="Constant">  get x:address:point, 1:offset</span>
 <span class="Constant">]</span>]
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   assume-console [
     press F4
   ]
@@ -470,15 +470,15 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> run-shows-non-literal-get-argument-errors [
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
 <span class="Constant">recipe foo [</span>
 <span class="Constant">  local-scope</span>
 <span class="Constant">  x:number &lt;- copy 0</span>
 <span class="Constant">  y:address:point &lt;- new point:type</span>
 <span class="Constant">  get *y:address:point, x:number</span>
 <span class="Constant">]</span>]
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   assume-console [
     press F4
   ]
@@ -505,13 +505,13 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   <span class="Comment"># try to run a file with an error</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[ </span>
 <span class="Constant">recipe foo [</span>
 <span class="Constant">  local-scope</span>
 <span class="Constant">  x:number &lt;- copy y:number</span>
 <span class="Constant">]</span>]
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   assume-console [
     press F4
   ]
@@ -551,10 +551,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># left editor is empty</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
   <span class="Comment"># right editor contains an illegal instruction</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[get 1234:number, foo:offset]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[get 1234:number, foo:offset]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   <span class="Comment"># run the code in the editors</span>
   assume-console [
     press F4
@@ -614,10 +614,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># left editor is empty</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
   <span class="Comment"># right editor contains an illegal instruction</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[get 1234:number, foo:offset]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[get 1234:number, foo:offset]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   <span class="Comment"># run the code in the editors multiple times</span>
   assume-console [
     press F4
@@ -645,14 +645,14 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">20/height</span>
   <span class="Comment"># left editor is empty</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[recipe foo [</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[recipe foo [</span>
 <span class="Constant">  {</span>
 <span class="Constant">    loop</span>
 <span class="Constant">  }</span>
 <span class="Constant">]</span>]
   <span class="Comment"># right editor contains an instruction</span>
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[foo]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   <span class="Comment"># run the sandbox</span>
   assume-console [
     press F4
@@ -676,7 +676,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
   assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
   <span class="Comment"># generate a stash and a error</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[recipe foo [</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[recipe foo [</span>
 <span class="Constant">local-scope</span>
 <span class="Constant">a:number &lt;- next-ingredient</span>
 <span class="Constant">b:number &lt;- next-ingredient</span>
@@ -684,8 +684,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 _, c:number<span class="Special"> &lt;- </span>divide-with-remainder a, b
 <span class="muControl">reply</span> b
 ]]
-  <span class="Constant">2</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[foo 4, 0]</span>
-  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:address:array:character, <span class="Constant">2</span>:address:array:character
+  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[foo 4, 0]</span>
+  <span class="Constant">3</span>:address:programming-environment-data<span class="Special"> &lt;- </span>new-programming-environment screen:address:screen, <span class="Constant">1</span>:text, <span class="Constant">2</span>:text
   <span class="Comment"># run</span>
   assume-console [
     press F4
diff --git a/html/edit/012-editor-undo.mu.html b/html/edit/012-editor-undo.mu.html
index 0518d0ad..ff375027 100644
--- a/html/edit/012-editor-undo.mu.html
+++ b/html/edit/012-editor-undo.mu.html
@@ -136,8 +136,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-undo-typing [
   <span class="Comment"># create an editor and type a character</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   assume-console [
     type <span class="Constant">[0]</span>
@@ -266,8 +266,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-undo-typing-multiple [
   <span class="Comment"># create an editor and type multiple characters</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   assume-console [
     type <span class="Constant">[012]</span>
@@ -292,8 +292,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-undo-typing-multiple-2 [
   <span class="Comment"># create an editor with some text</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># type some characters</span>
   assume-console [
@@ -338,8 +338,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-undo-typing-enter [
   <span class="Comment"># create an editor with some text</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[  abc]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[  abc]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># new line</span>
   assume-console [
@@ -401,8 +401,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-redo-typing [
   <span class="Comment"># create an editor, type something, undo</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   assume-console [
     type <span class="Constant">[012]</span>
@@ -465,8 +465,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-redo-typing-empty [
   <span class="Comment"># create an editor, type something, undo</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   assume-console [
     type <span class="Constant">[012]</span>
@@ -511,10 +511,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-work-clears-redo-stack [
   <span class="Comment"># create an editor with some text, do some work, undo</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def</span>
 <span class="Constant">ghi]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   assume-console [
     type <span class="Constant">[1]</span>
@@ -553,8 +553,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-redo-typing-and-enter-and-tab [
   <span class="Comment"># create an editor</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># insert some text and tabs, hit enter, some more text and tabs</span>
   assume-console [
@@ -710,10 +710,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-undo-touch [
   <span class="Comment"># create an editor with some text</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def</span>
 <span class="Constant">ghi]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># move the cursor</span>
   assume-console [
@@ -801,10 +801,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
   <span class="Comment"># screen has 1 line for menu + 3 lines</span>
   assume-screen <span class="Constant">5/width</span>, <span class="Constant">4/height</span>
   <span class="Comment"># editor contains a wrapped line</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">b</span>
 <span class="Constant">cdefgh]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
   <span class="Comment"># position cursor at end of screen and try to move right</span>
   assume-console [
     left-click <span class="Constant">3</span>, <span class="Constant">3</span>
@@ -863,10 +863,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-undo-left-arrow [
   <span class="Comment"># create an editor with some text</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def</span>
 <span class="Constant">ghi]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># move the cursor</span>
   assume-console [
@@ -907,10 +907,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-undo-up-arrow [
   <span class="Comment"># create an editor with some text</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def</span>
 <span class="Constant">ghi]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># move the cursor</span>
   assume-console [
@@ -957,10 +957,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-undo-down-arrow [
   <span class="Comment"># create an editor with some text</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def</span>
 <span class="Constant">ghi]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># move the cursor</span>
   assume-console [
@@ -1001,13 +1001,13 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-undo-ctrl-f [
   <span class="Comment"># create an editor with multiple pages of text</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">b</span>
 <span class="Constant">c</span>
 <span class="Constant">d</span>
 <span class="Constant">e</span>
 <span class="Constant">f]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># scroll the page</span>
   assume-console [
@@ -1036,13 +1036,13 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-undo-page-down [
   <span class="Comment"># create an editor with multiple pages of text</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">b</span>
 <span class="Constant">c</span>
 <span class="Constant">d</span>
 <span class="Constant">e</span>
 <span class="Constant">f]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># scroll the page</span>
   assume-console [
@@ -1071,13 +1071,13 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-undo-ctrl-b [
   <span class="Comment"># create an editor with multiple pages of text</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">b</span>
 <span class="Constant">c</span>
 <span class="Constant">d</span>
 <span class="Constant">e</span>
 <span class="Constant">f]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># scroll the page down and up</span>
   assume-console [
@@ -1107,13 +1107,13 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-undo-page-up [
   <span class="Comment"># create an editor with multiple pages of text</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[a</span>
 <span class="Constant">b</span>
 <span class="Constant">c</span>
 <span class="Constant">d</span>
 <span class="Constant">e</span>
 <span class="Constant">f]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># scroll the page down and up</span>
   assume-console [
@@ -1143,10 +1143,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-undo-ctrl-a [
   <span class="Comment"># create an editor with some text</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def</span>
 <span class="Constant">ghi]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># move the cursor, then to start of line</span>
   assume-console [
@@ -1187,10 +1187,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-undo-home [
   <span class="Comment"># create an editor with some text</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def</span>
 <span class="Constant">ghi]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># move the cursor, then to start of line</span>
   assume-console [
@@ -1231,10 +1231,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-undo-ctrl-e [
   <span class="Comment"># create an editor with some text</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def</span>
 <span class="Constant">ghi]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># move the cursor, then to start of line</span>
   assume-console [
@@ -1275,10 +1275,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-undo-end [
   <span class="Comment"># create an editor with some text</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def</span>
 <span class="Constant">ghi]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># move the cursor, then to start of line</span>
   assume-console [
@@ -1319,10 +1319,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-undo-multiple-arrows-in-the-same-direction [
   <span class="Comment"># create an editor with some text</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def</span>
 <span class="Constant">ghi]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># move the cursor</span>
   assume-console [
@@ -1373,10 +1373,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-redo-touch [
   <span class="Comment"># create an editor with some text, click on a character, undo</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def</span>
 <span class="Constant">ghi]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   assume-console [
     left-click <span class="Constant">3</span>, <span class="Constant">1</span>
@@ -1430,8 +1430,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-separates-undo-insert-from-undo-cursor-move [
   <span class="Comment"># create an editor, type some text, move the cursor, type some more text</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   assume-console [
     type <span class="Constant">[abc]</span>
@@ -1579,8 +1579,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-undo-and-redo-backspace [
   <span class="Comment"># create an editor</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># insert some text and hit backspace</span>
   assume-console [
@@ -1724,8 +1724,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-undo-and-redo-delete [
   <span class="Comment"># create an editor</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># insert some text and hit delete and backspace a few times</span>
   assume-console [
@@ -1913,9 +1913,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-undo-and-redo-ctrl-k [
   <span class="Comment"># create an editor</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># insert some text and hit delete and backspace a few times</span>
   assume-console [
@@ -2015,9 +2015,9 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-undo-and-redo-ctrl-u [
   <span class="Comment"># create an editor</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[abc</span>
 <span class="Constant">def]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># insert some text and hit delete and backspace a few times</span>
   assume-console [
@@ -2116,8 +2116,8 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 <span class="muScenario">scenario</span> editor-can-undo-and-redo-ctrl-u-2 [
   <span class="Comment"># create an editor</span>
   assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
-  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
-  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:address:array:character, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
+  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span>new <span class="Constant">[]</span>
+  <span class="Constant">2</span>:address:editor-data<span class="Special"> &lt;- </span>new-editor <span class="Constant">1</span>:text, screen:address:screen, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
   editor-render screen, <span class="Constant">2</span>:address:editor-data
   <span class="Comment"># insert some text and hit delete and backspace a few times</span>
   assume-console [