Scan backpressure and first emission fix #3171
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This was referenced Aug 21, 2015
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stealthcode
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Scan backpressure and first emission fix
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Fixes #3168
If there is no initial value, there is no need to manipulate the request amounts.
If there is an initial value, we must do a full emitter-loop with value queueing because now the downstream request can race with the first onNext or the setting of the upstream producer. The downside is the increased overhead which should be reduced when the spsc unbounded queues get merged.