My project idea is to write a map rendering software. The map style could be a 'data structure', but the more power you give the user, the better, so allowing them to treat the data structure as (lisp) code was a brain wave.
So if I give people basic building blocks, I can see what they're using and replace popular functions/macros with optimized stuff, which is another great benefit!
Gotta finish other projects first though
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