Well... Some people does usually implicate ‘not all people, and not even all people except a non-sizeable minority’, but if we go by implicatures rather than literal meanings, X has fingernails (in contexts where everyone knows X is a human), in my experience at least, usually implicates that X's fingernails are not trimmed nearly as short as possible, since the literal meaning would be quite uninformative once you know X is a human.