Fix singledispatch register signature #13578
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Diff from mypy_primer, showing the effect of this PR on open source code: ibis (https://github.com/ibis-project/ibis)
- ibis/backends/polars/compiler.py:745: note: def register(self, cls: type[Any], func: None = ...) -> Callable[[Callable[..., Any]], Callable[..., Any]]
+ ibis/backends/polars/compiler.py:745: note: def register(self, cls: type[Any] | UnionType, func: None = ...) -> Callable[[Callable[..., Any]], Callable[..., Any]]
- ibis/backends/polars/compiler.py:745: note: def register(self, cls: type[Any], func: Callable[..., Any]) -> Callable[..., Any]
+ ibis/backends/polars/compiler.py:745: note: def register(self, cls: type[Any] | UnionType, func: Callable[..., Any]) -> Callable[..., Any]
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mmingyu
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May 16, 2025
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Fixes #13560
Available since Python 3.11 according to the docs.
It also supports
_UnionGenericAliasvalues (i.e. values resulting from typingUnion[X, Y]), but idk if it’s possible to express that.