Hi,

I'm creating a Source via GraphStageLogic which makes calls to another api, 
which happens to return a Source. However I'm unsure how to deal with 
Source/Futures in a GraphStageLogic. It seems that I want my shape to look 
like

val shape: SourceShape[Seq[String]] = SourceShape(out)


but I get back a Source[ByteString, NotUsed] which I can covert to 
Future[Seq[String]] 
via runWith(Sink.seq). So should I make my shape

val shape: SourceShape[Future[Seq[String]]] = SourceShape(out)


But then I need to materialize the Source inside the onPull(), which 
doesn't seem right. Is there a better way to handle this situation?

Thanks!

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