BUG: Inconsistent behavior with groupby and copy-on-write #63232
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doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.AGENTS.md.We have a similar issue when grouping by NumPy arrays. Here, there is no cheap
.copy(deep=False)we can use; always copying can be expensive. This case makes me think we should just document "don't do this" in general.