[issue44635] Convert None to NoneType in the union type constructor

[Serhiy Storchaka]

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


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keywords: +patch
pull_requests: +25679
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/27136

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<https://bugs.python.org/issue44635>
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