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The takeWhile/collect pattern only re-checks its predicate when the
NEXT upstream value emits, so once nextSubscribeBidi found its
target Subscribe bidi, the helper sat blocked waiting for a
follow-up bidi that may never come — turning groups_are_demuxed_by_
subscribeId into a 5-minute hang on tests that open exactly two
subscribes (the announce-watch bidi happened to land between, but
relying on it to nudge the flow forward is fragile).
Switched to transformWhile { … emit(…); false }.firstOrNull() so
the upstream collection terminates synchronously after the first
match. Warm-daemon test time drops from multi-minute timeout back
to the expected ~10 ms range.
https://claude.ai/code/session_01HXf3zG3F2ev2ASeQju7Y5S