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Description

The is_pandas_nullable_extension_dtype branch would have captured a CategoricalDtype with e.g. pandas.StringDtype (the new default) which is not designed to expect a CategoricalDtype. Fixes 17 test failures.

Checklist

  • I am familiar with the Contributing Guidelines.
  • New or existing tests cover these changes.
  • The documentation is up to date with these changes.

@mroeschke mroeschke self-assigned this Jan 22, 2026
@mroeschke mroeschke requested a review from a team as a code owner January 22, 2026 00:06
@mroeschke mroeschke added the bug Something isn't working label Jan 22, 2026
@mroeschke mroeschke requested review from Matt711 and TomAugspurger and removed request for a team January 22, 2026 00:06
@mroeschke mroeschke added Python Affects Python cuDF API. breaking Breaking change labels Jan 22, 2026
@GPUtester GPUtester moved this to In Progress in cuDF Python Jan 22, 2026
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breaking Breaking change bug Something isn't working Python Affects Python cuDF API.

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