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I ran head-on into the "time gap" (#844) issue while working on a stream processing use case (and new 'pivot' operator I'm writing).
This is a solution. It's still not ideal as the Javadocs of BufferUntilSubscriber mention, but this is working better than nothing and does not require blocking threads.
A better solution will come as part of the back pressure work where BufferUntilSubscriber will evolve to have a bounded buffer.