[issue37920] Support subscripting os.PathLike and make it valid at runtime

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

Making an existing stdlib class generic has to be considered carefully, otherwise it may break backward compatibility.

As I wrote in the typeshed issue, I actually think the status quo is fine. But I'd like to hear you out about how it causes problems in VS Code (that can't be fixed by adapting VC Code to reality).

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versions: +Python 3.9 -Python 3.7

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<https://bugs.python.org/issue37920>
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