[issue46685] Add additional tests for new features in `typing.py`

[Jelle Zijlstra]

Change by Jelle Zijlstra <jelle.zijlstra at gmail.com>:


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46685>
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