pull‑flat‑merge is a tiny **pull‑stream** utility that merges a stream of streams by emitting each inner value as soon as it arrives, rather than preserving the original ordering used by `.flatten`. It provides both a direct transformer (`join()`) and a composable `chain` helper, making it useful for Node.js developers who work with asynchronous pull‑streams and need out‑of‑order, low‑latency merging of multiple sub‑streams.