I think you mean "calling"? Anyway this advice is very clearly not being followed. It's not uncommon that correct error handling is impossible. Because of "spec

I think you mean "calling"? Anyway this advice is very clearly not being followed. It's not uncommon that correct error handling is impossible. Because of "specification bugs" interacting edge cases can cause undetectable failures. And those problems have been this way for decades. The world you wish for doesn't exist. Not saying it shouldn't.