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[pull] main from pydata:main - #1041

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Jul 30, 2026
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[pull] main from pydata:main#1041
pull[bot] merged 1 commit into
Illviljan:mainfrom
pydata:main

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Created by pull[bot] (v2.0.0-alpha.4)

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PandasMultiIndex.__init__ used `idx.name or f"{dim}_level_{i}"`, which treats
any falsy level name as unnamed. Stacking a dimension named `""`, `False` or
`0` therefore renamed the level, desynchronising it from level_coords_dtype
and raising KeyError in create_variables.

Only substitute a synthetic name when the level name is actually None.

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Deepak Cherian <dcherian@users.noreply.github.com>
@pull pull Bot locked and limited conversation to collaborators Jul 30, 2026
@pull pull Bot added the ⤵️ pull label Jul 30, 2026
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pull Bot merged commit 95ef2b0 into Illviljan:main Jul 30, 2026
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