Don't simplify away Any when joining unions #9301
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Previously join of `Union[int, Any]` and `Union[int, None]` could be `Union[int, None]` (we lost the `Any` type). Fix this by replacing a subtype check with a proper subtype check when joining unions.
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Previously join of
Union[int, Any]andUnion[int, None]could beUnion[int, None](we lost theAnytype). Fix this by replacing asubtype check with a proper subtype check when joining unions.