[issue44676] Add ability to serialise types.Union

[Ken Jin]

Ken Jin <kenjin4096 at gmail.com> added the comment:

This is fixed. Thanks Yurii and Serhiy for the patches :) (and everyone else for the reviews too).

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

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