Round 5 of the seed shrink. transduce is the canonical 5-liner over reduce
(which already honors reduced and steps lazy seqs); eduction composes with
comp and stays eager into a vector (documented divergence, as before);
td-comp — eduction's last caller — is deleted from the seed. transient
accepts tuples now (reader vectors / map entries), so (into [] (first {:a 1}))
keeps working everywhere a vector does.
into was moved, benched, and moved back: the overlay call layers cost the
into-vec suite ~11% back-to-back (536 vs 480ms), the same per-call wall that
sent even?/odd? home in round 4. A transient conj! fast path didn't pay for
itself either (jolt call overhead dominates, not the per-element conj). The
seed keeps core-into + its private transduce machinery; the binding count
still drops by three.
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