* fix arginfo with nullable types
* pemalloc
* 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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+* think about a better system for EXTVARs, separate \set and \get functions are clunky
+* impl_def_val: allow num_exp
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