Fix: Change None values to NaN in combine_first method for better handling of missing data #59987
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Description
This pull request addresses issue #58977 by improving the handling of missing data in the
combine_first
method. The changes ensure thatNone
values are replaced withNaN
, which allows for better integration with other Pandas functions that expectNaN
values.Related Issue
Series.combine_first
replacesNone
withNaN
at index not provided byother
#58977Checklist