(sequence xform coll) was eager (transduce into a tuple), so it hung on infinite
input. Now it's a lazy buffered transducer pump: pulls one source element at a
time, pushes it through the transducer's reducing fn into a buffer, and emits
buffered outputs lazily — so (take 3 (sequence (map inc) (range))) works.
Honors `reduced` (early stop) and runs the completion arity to flush stateful
transducers. Normalizes the source via core-seq (walking a raw pvec/set would
misfire — seq-done? uses length, which counts a pvec table's keys).
The other jolt-b56 items stay native by design: sequential?/seqable? are
representation-coupled and representation-mode-sensitive (jolt-1vx); realized?
reads the tagged :realized flag; cat/eduction/transduce/halt-when/unreduced/
ensure-reduced are the transducer/Reduced kernel the issue says to keep native.
Note: partition-all has no transducer (1-arg) arity, so (sequence (partition-all
2) …) errors — a pre-existing gap, unrelated to this change.
Gate: conformance 249x3, lazy-infinite 44/44, fixpoint, self-host, specs+unit green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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