feat: grind annotations, Iter(M).sum and toList+take+(productive combinator) composition lemmas#12414
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feat: grind annotations, Iter(M).sum and toList+take+(productive combinator) composition lemmas#12414datokrat wants to merge 3 commits intopaul/base/iterators/improvements2from
grind annotations, Iter(M).sum and toList+take+(productive combinator) composition lemmas#12414datokrat wants to merge 3 commits intopaul/base/iterators/improvements2from
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grind annotations and toList+take+(productive combinator) composition lemmasgrind annotations, Iter(M).sum and toList+take+(productive combinator) composition lemmas
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This PR adds (1) grind annotations, (2)
Iter(M).sumwith lemmas and (3) several new lemmas about composition of iterator combinators (map,take,drop,takeWhile,zip) and marks many existing lemmas with thegrind =attribute. The new lemmas establish equalities such as((it.map f).take k).toList = (it.take k).toList.map f, which are useful for equational reasoning on productive iterators.