The async onData handler never paused its subscription, so pipelined
requests interleaved mid-handler — violating D-72's serial-dispatch
contract — while the shared StringBuffer could re-frame underneath an
in-flight await and the per-chunk utf8.decode corrupted runes split
across reads. One `await for` over a persistent Utf8Decoder +
LineSplitter fixes framing, decoding, and serialization at once.
Tests: two frames pipelined in one write dispatch strictly in order;
a frame split mid-rune across writes decodes intact.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
jpmschweitzerandClaude Fable 5
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