[pull] main from pydata:main#990
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The codes passed to pd.MultiIndex were being converted from cache-friendly ndarrays into Python lists to silence a mypy arg-type error introduced in #10694. The extra per-element conversion dominates runtime for large indexes (~13s on a 100x2000x300 array). Pass the ndarrays directly and suppress the type error the same way as for `levels` just above. Fixes #11305 Co-authored-by: Claude <noreply@anthropic.com>
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