[issue44676] Add ability to serialise types.Union

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado <pablogsal at gmail.com>:


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pull_requests: +25876
pull_request: https://github.com/python/cpython/pull/27333

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