Hello,

I'm reading through the streams docs, and I'm currently on the first 
Duplicator example 
(http://doc.akka.io/docs/akka-stream-and-http-experimental/1.0-M2/scala/stream-customize.html)

I'm wondering if there are any guarantees on the order of calling onPush() 
and onPull()? For example, that onPush() won't be called twice in 
succession, but that onPush() and onPull calls are interleaved? Otherwise 
we may end up not duplicating elements (since we only remember the last 
one).

I guess this depends if there is any buffering around a custom 
push-pull-stage, but I would expect it to have a default buffer of awaiting 
elements?

Adam

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