JuliaLang/julia — comment on commit 5a52719ce7fa60e11c4d717be5a4bfa1eacc5213
File: src/flisp/julia_extensions.c line 44
By StefanKarpinski:

I thought some would be safe as parts of identifiers and others not so much. Aren't there some space characters and such that are high up there? Also, if we eventually support using Unicode characters for operators like `≤` and stuff, then this rule will have to change, no?