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BUG: Groupby.sum, DataFrame.sum and Series.sum for object type should be NA instead of 0 for all-nan values #21993

BUG: Groupby.sum, DataFrame.sum and Series.sum for object type should be NA instead of 0 for all-nan values

BUG: Groupby.sum, DataFrame.sum and Series.sum for object type should be NA instead of 0 for all-nan values #21993