BUG: Change default of observed in Series.groupby #62025
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doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.Fix for #57330. In all tests where
observedmakes a difference, we explicitly specifyobservedso this wasn't noticed. The deprecation itself was properly done (saying that we were changing the default to True), it was only the enforcement of the deprecation that had a mistake.