The tough one is that no-one wants an ugly sys._getframe() call, but by avoiding it in the standard library, we force each library that needs this to have the ugly sys._getframe() call rather than it being an unpleasant implementation detail of get_type_hints that users of the function don't have to know about.

That said, I've only hit this so far when writing a unit test, but will update this issue if I see real-world cases of this.