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+I care a lot about being able to automatically check _any_ property about my
+program before it ever runs. However, some things don't have tests yet.
+
+### Compromises
+
+Lua is dynamically typed. Tests can't patch over lack of type-checking.
+
+* All strings are UTF-8. Bytes within them are not characters. I try to label
+  byte offsets as _offset, and character positions as _pos. For example,
+  string.sub should never use a _pos to substring, only an _offset.
+
+
+### Todo list
+
+drawing
+  select a point and move it
+  select a point and name it
+
+persistence:
+  draw a line, circle, rectangle, square, polygon, quit, restart. All the shapes you drew should still be visible.
+  select a point and name it, quit, restart. Name is still visible.
+
+undo:
+  naming points
+  deleting points
+  moving points
+
+resize:
+  create a file containing a long line of characters without spaces. try
+  resizing the window vertically and horizontally, as far as possible.