BUG: PeriodIndex.asof_locs
looks fine. does this have any user facing impliacations? e.g. does it need a whatsnew > does this have any user facing impliacations? e.g. does it need a whatsnew

passing nonsense (e.g. an Int64Index) to `Series.asof` with a PeriodIndex will now raise instead of silently being wrong thanks !