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mk: tako + dropo — Peano-indexed prefix and suffix
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(tako n l prefix) — prefix is the first n elements of l.
(dropo n l suffix) — suffix is l after dropping the first n.

Both use a Peano natural for the count. Round-trip holds:
  (tako n l) ⊕ (dropo n l) = l   (verified by an end-to-end test)

9 new tests, 368/368 cumulative.
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giles
2026-05-08 11:32:33 +00:00
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@@ -173,6 +173,9 @@ _(none yet)_
_Newest first._
- **2026-05-08** — **tako + dropo (Peano-indexed prefix/suffix)**: takes / drops
the first n elements via a Peano-encoded count. Round-trip
`(tako n l) ⊕ (dropo n l) = l` holds. 9 new tests, 368/368 cumulative.
- **2026-05-08** — **eveno / oddo Peano predicates**: classic miniKanren parity
relations. eveno: 0 or successor-of-successor of even; oddo: 1 or
successor-of-successor of odd. Both run forward (test) and backward