BUG: Fix cast_pointwise_result with all-NA values #9
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doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.Description
Fix a bug in
BaseMaskedArray._cast_pointwise_resultwith all-NA values results returnedobjectdtype instead of preserving the original dtype.Additional Notes
In the original issue report the behavior was described for
BooleanDtype. While preparing the fix, I added tests not only forBooleanDtypebut also for integer dtypes (e.g.Int64) under the same all-NA condition. I thought it would be reasonable to ensure consistency across multiple ExtensionArray types.If it's unnecessary or out of scope for this PR, I'll fix the tests only to the Boolean case as reported in the issue.