API: transform behaves differently with 'ffill' on DataFrameGroupBy and SeriesGroupBy (#39638)
API: transform behaves differently with 'ffill' on DataFrameGroupBy and SeriesGroupBy (#39638)


dsm054/pandas,jorisvandenbossche/pandas,jorisvandenbossche/pandas,dsm054/pandas,rs2/pandas,jorisvandenbossche/pandas,pandas-dev/pandas,datapythonista/pandas,gfyoung/pandas,datapythonista/pandas,dsm054/pandas,pandas-dev/pandas,datapythonista/pandas,rs2/pandas,rs2/pandas,gfyoung/pandas,gfyoung/pandas,pandas-dev/pandas,datapythonista/pandas,dsm054/pandas,pandas-dev/pandas,rs2/pandas,jorisvandenbossche/pandas,gfyoung/pandas,dsm054/pandas,gfyoung/pandas