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mk: intarith.sx — ground-only integer arithmetic via project
pluso-i / minuso-i / *o-i / lto-i / lteo-i / neqo-i wrap host arithmetic
in project. They run at native speed but require their inputs to walk
to ground numbers — they are NOT relational the way Peano pluso is.
Use them when puzzle size makes Peano impractical (which is most cases
beyond toy examples).

Composes with relational goals — for instance,
  (fresh (x) (membero x (1 2 3 4 5)) (lto-i x 3) (== q x))
filters the domain by < 3 and returns (1 2).

18 new tests, 287/287 cumulative.
2026-05-08 11:02:09 +00:00
..