You’re blaming the victim here. Not being re-entrant makes the user-facing API unnecessarily complicated. It creates an avoidable foot gun. It trips people up

You’re blaming the victim here. Not being re-entrant makes the user-facing API unnecessarily complicated. It creates an avoidable foot gun. It trips people up for no good reason. And unlike stuff like signed integer overflow, there doesn’t even seem to be a (dubious) performance argument to justify this insanity. The standard should be fixed and that’s the end of it.