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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.