Yogthos fcdf0ff535 core: Phase 4 — move reduce-kv to the overlay, fixing the vector case ... reduce-kv is pure over reduce/keys/get/nth, so it moves to 20-coll with no host surface. Both branches fold through reduce, which fixes two latent bugs in the Janet version: on a vector it saw the pvec as a table and folded over its internal keys instead of the indices, and it ignored reduced entirely. nil folds to init. Added vector-index, reduced, and nil spec cases plus a 3-mode conformance case for the vector fix.		2026-06-07 20:05:25 -04:00
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core	core: Phase 4 — move reduce-kv to the overlay, fixing the vector case	2026-06-07 20:05:25 -04:00