[issue44676] Add ability to serialise types.Union

[Yurii Karabas]

Change by Yurii Karabas <1998uriyyo at gmail.com>:


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keywords: +patch
pull_requests: +25792
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/27244

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44676>
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