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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
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.
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