[issue43766] Implement PEP 647 (User-Defined Type Guards) in typing.py

[Ken Jin]

Change by Ken Jin <kenjin4096 at gmail.com>:


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keywords: +patch
pull_requests: +24018
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/25282

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<https://bugs.python.org/issue43766>
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