I think parties are designed to be a temporary thing so I'm against having them stored forever.
That said 10 isn't a lot but 100 is too much I think. Often times people will want to clear out the party history before inviting another person into the group and if it was 100 long they'd have to spam 100 lines of crap.
Of course this could always be fixed with a 'party line clearhistory' command I suppose.
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If you say plz because it is shorter than please, then I will say no because it is shorter then yes.
