giles
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Iterative Levenshtein DP with rolling 1D arrays for O(min(m,n)) space. Distances: kitten -> sitting : 3 saturday -> sunday : 3 abc -> abc : 0 "" -> abcde : 5 intention -> execution : 5 ---------------------------- total : 16 Complementary to the existing levenshtein.ml which uses the exponential recursive form (only sums tiny strings); this one is the practical iterative variant used for real ED. Tests the recently-fixed <- with bare `if` rhs: curr.(j) <- (if m1 < c then m1 else c) + 1 153 baseline programs total.