DEPR: lowercase strings w, d, b and c denoting frequencies in Week, Day, BusinessDay and CustomBusinessDay classes #58998
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xref #57986
d,bandcdenoting frequencies inDay,BusinessDayandCustomBusinessDayin favour ofD,BandCw,w-mon,w-tue, etc. denoting frequencies inWeekin favour ofW,W-MON,W-TUE, etc.we can deprecated lowercase strings
w,d,bandcforTimedeltain a separate PR