Positions based on Enumerate
#816
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`Positions` is tested to be fused, for specialized methods and has two doctests. No other test. While I was adding `Enumerate` in `Positions` internals, running `cargo test positions` told me `rfold` was wrong. The silly mistake was on `next_back` instead and this test would have helped me. Plus, I noticed that the documentation was just a bit wrong.
phimuemue
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Dec 9, 2023
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phimuemue
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Thank you, @Philippe-Cholet
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Following #813 (comment), with this PR,
Positionsnow usesEnumerateinternally.nextandnext_backare now based onfind_mapinstead of "while-next" loops. It would be useful performance-wise for iterators specializingtry_[r]fold. I intend to do the same for other while-next loops (where benchmarks show times decrease, up to -20%).filter_mapto avoid*copy).