Refactor dedupBy to drop intermediary strict list with mapWithIndex. #22438
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yangzai
commented
Nov 27, 2025
| let | ||
| indexed = zip xs [1..length xs] | ||
| comp x y = cmp (fst x) (fst y) | ||
| indexed = mapWithIndex (,) xs |
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New indices are off by 1 and swapped, but these are inconsequential.
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Relates to #20591.