[Merged by Bors] - refactor(data/finset/nat_antidiagonal): state lemmas with cons instead of insert #14533
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This puts less of a burden on the caller rewriting in the forward direction, as they don't have to prove obvious things about membership when evaluating sums.
Since this adds the missing
finset.map_cons
, a number of uses ofmultiset.map_cons
now need qualified names.