-* move numbers to the lexer
* avoid allocs inside structures by reallocating the whole structure
* let the various list types be hashtables where appropriate
* check out jit-dynamic
* fix arginfo with nullable types
* pemalloc
-* unions
-* callbacks and function pointers
-* let impl_Var point to impl_arg, just like decl_var?
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+* CPP style #if(def(ined)) support in parser.re with a HashTable
+* think about a better system for EXTVARs, separate \set and \get functions are clunky
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