Guido van Rossum <gu...@python.org> added the comment:

Hi Kevin,

If you want to work on this, could you come up with some test cases that
try to explore edge cases for this behavior? Ideally some that already
pass, and some that currently don't pass (because of the limitation
mentioned by Ivan). It's possible that the tests for typing.py already
contain some suitable passing tests. You could then investigate whether
your proposal seems to work. If it does, you can submit a PR and we can lay
this issue to rest!

--Guido

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<https://bugs.python.org/issue38908>
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