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fix: import ujson_dumps from pandas.io.json - #11

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fix/pandas31
Oct 26, 2026
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fix/pandas31

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pandas 3.1 removed the private pandas._libs.json, so cirro failed on import. pandas.io.json.ujson_dumps is public in pandas 2.2 through 3.1, which replaces the try/except; pandas>=2.2 records that floor (2.1 lacks the name).

Tests: 1400 passed with pandas 3.1.0 / anndata 0.13.4 / zarr 3.4.1.

Closes #10

🤖 Generated with Claude Code

pandas 3.1 removed the private pandas._libs.json module, so cirro failed
on import. pandas.io.json.ujson_dumps is public from pandas 2.2 on.

Closes #10

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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@Marius1311
Marius1311 merged commit b0763eb into main Oct 26, 2026
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Marius1311 deleted the fix/pandas31 branch October 26, 2026 10:06
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cirro fails to start with pandas 3.1: pandas._libs.json was removed

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