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@jbrockmendel jbrockmendel changed the title Bug index ea expansion BIG: adding row to DataFrame with EADtype index loses dtype Sep 15, 2025
@simonjayhawkins
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Thanks @jbrockmendel for the PR

does this also close any of the issues listed in #41626 (comment)

@simonjayhawkins simonjayhawkins changed the title BIG: adding row to DataFrame with EADtype index loses dtype BUG: adding row to DataFrame with EADtype index loses dtype Sep 16, 2025
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does this also close any of the issues listed in #41626 (comment)

i dont think so, no. on second look i think that comment was largely inaccurate.

@mroeschke mroeschke added ExtensionArray Extending pandas with custom dtypes or arrays. Index Related to the Index class or subclasses Dtype Conversions Unexpected or buggy dtype conversions labels Sep 16, 2025
@mroeschke mroeschke added this to the 3.0 milestone Sep 16, 2025
@mroeschke mroeschke merged commit bc500f7 into pandas-dev:main Sep 16, 2025
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Thanks @jbrockmendel

@jbrockmendel jbrockmendel deleted the bug-index-ea-expansion branch September 16, 2025 18:55
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API: make CategoricalIndex._concat consistent with pd.concat
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