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I'm working on fixes to breakages in
v44.0.0
and it felt better to split things up instead of trying to make one larger disparate PR.This PR adds list
intersect
andsubset
both of which are needed for the upcoming fixes. Care was taken to ensure they didn't runN^2
. They roughly run in2*nlogn + n
wheren = max(lhs.len, rhs.len)
though I am assumingsortBy
isnlogn
which I've not verified