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ENH: Add limit_area to groupby.ffill/bfill #56533

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@rhshadrach

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@rhshadrach

#56531 is adding these arguments to Series/DataFrame ffill/bfill due to the deprecation in interpolate. While groupby doesn't have interpolate and so there is no loss of functionality, if an efficient algorithm can implement limit_area I think we should do it for API consistency.

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    API - ConsistencyInternal Consistency of API/BehaviorEnhancementGroupbyMissing-datanp.nan, pd.NaT, pd.NA, dropna, isnull, interpolateNeeds DiscussionRequires discussion from core team before further action

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