Joseph Doherty
90de38910d
Found while load-verifying #856: ShutdownAsync_cancels_the_event_stream_and_releases_the_pump timed out 7/700 under parallel load. The fake's StreamCancelled was set by a CancellationToken registration scoped by `using` inside the async iterator. On Cancel() the newer ReadAllAsync registration runs first and resumes the iterator on a pool thread, whose `using` can dispose our registration while Cancel() is still walking the callback list - so it never runs. Signal from the iterator's finally (when the token is cancelled) instead, which also proves the stream actually ended. 0/700 after. Claude-Session: https://claude.ai/code/session_01GT67AD99zQQqpLCVm3p7xk