IMHO from a theory POV, it violates the/my principle of least surprise. Compilers are typically strict and I'm ok with that - my mental models of programing are

IMHO from a theory POV, it violates the/my principle of least surprise. Compilers are typically strict and I'm ok with that - my mental models of programing are built around that unforgivingness and I like it, because if I play by the rules, I know there'll be no surprises (ideally). When the rules are relaxed, I have to remember more stuff. It's easier for me to know that ABC is ABC, and never abc or a_b_c. I think I remember reading early remarks from the Nim team that you can opt-in to the symbol sensitivity but it's a marker comment per-file, or some kind of DIY preprocessor which does the same. I'd be happy if it was a CLI switch. All that said, and in practice, clearly a lot of people are fine with this and even like it. I'd much rather Nim exist with this (IMO) oddity than not at all.