DOC/DEPR: sep vs pat in series.str.partition

DOC/DEPR: sep vs pat in series.str.partition: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). I think the kwarg should be renamed to sep , which makes more sense for partitioning something than pat , which sounds like it's about a regex pattern.