BUG: Fix user dtype can-cast with python scalar during promotion #27543
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The can-cast code for "Python scalars" was old and did not correctly take into account possible user-dtypes with respect to NEP 50 weak promotion. To do this, we already had the necessary helper functions that go via promotion (although it took me some brooding to remember ;)). So the fix is rather simple. Actually adding CI/test for the fix is unfortunately hard as it requires such a user DType.
jakevdp
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Oct 28, 2024
NumPy changed weak promotion semantics in numpy/numpy#27543, and this caused some of our tests to fail for types that cannot represent zero.
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Backport of #27534.
The can-cast code for "Python scalars" was old and did not correctly take into account possible user-dtypes with respect to NEP 50 weak promotion.
To do this, we already had the necessary helper functions that go via promotion (although it took me some brooding to remember ;)).
So the fix is rather simple. Actually adding CI/test for the fix is unfortunately hard as it requires such a user DType.