This isn't a prerequisite, since the existing naive character sort approach is not communicated either. In fact, it's almost universally unexpected by any user who hasn't written a naive string sort. Apple doesn't do this, and I very much did not need it communicated to me why 10 was coming after 2, because that's what everyone, who's not a programmer, expects.

As a litmus test, go ask some people, who are not programmers, without loading the question beyond "here are some files, how would you expect for them to be displayed in a list?". Show the lists side by side. It should not surprise you.