[issue44732] Rename types.Union to types.UnionType

[Pablo Galindo Salgado]

Pablo Galindo Salgado <pablogsal at gmail.com> added the comment:

This is a feature added to 3.10 so if we change it before the release there is no deprecation period needed. On the other hand if we don't get it to 3.10 is going to be much difficult to rename.

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<https://bugs.python.org/issue44732>
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