REF: de-duplication in libperiod (#38985)
REF: de-duplication in libperiod (#38985)


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