[issue32226] Implement PEP 560: Core support for typing module and generic types

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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nosy: +ned.deily
priority: normal -> release blocker

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32226>
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