TYP: fix ndarray.tolist() and .item() for unknown dtype
#28650
Merged
+23
−43
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Backport of #28644.
This fixes #27944 for both mypy and pyright.
I used the new generic generic type as a more direct alternative to match the .item() type of the underlying scalar-type. This way, we don't have to rely on on pyright's constraint set solving algorithm (recently introduced so not yet in pylance, and slightly incorrect in case of overlap). Mypy doesn't support constraint-sets, and it instead always chooses the first matching overload, causing it to behave incorrectly.