I'd argue that is_space() should be isspace(), the standard from <ctypes.h>. Pretty sure it wouldn't make the semantics of the language worse, but it's one less

I'd argue that is_space() should be isspace(), the standard from <ctypes.h>. Pretty sure it wouldn't make the semantics of the language worse, but it's one less wheel re-invented and makes the code a smidgen easier to read since there's one less concept to learn in it. Also one less thing to debug ...