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Another #mypy puzzler; apparently `mypy` doesn't know how to do type narrowing when you do an early return like this:
https://mypy-play.net/?mypy=latest&python=3.10&gist=29a4ee0232bf69953ec79680eb39f550
@kevinbrownsilva Ah, good point!
@pganssle I wonder if that has to do with subclasses? Like if you extended str in a class FancyStr and passed that in, your function is expecting FancyStr to be returned back. But you're only returning str, not FancyStr.