Support get_origin(Union[...]) in python 3.14#119
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In Python 3.14, `Union` is no longer a `typingGenericAlias`, so `get_origin(int | str)` didn't return `Union`. This changes that by explicitly checking for `is_union_type`. This adds a test for `get_origin(Union[...])`.
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In Python 3.14,
Unionis no longer atypingGenericAlias, soget_origin(int | str)didn't returnUnion. This changes that by explicitly checking foris_union_type. This adds a test forget_origin(Union[...]).