Merge multiple sources.

Fan-in stages


def merge[U >: Out, M](that: Graph[SourceShape[U], M], eagerComplete: Boolean = false): Repr[U]
def mergeMat[U >: Out, Mat2, Mat3](that: Graph[SourceShape[U], Mat2], eagerComplete: Boolean = false)(matF: (Mat, Mat2) ⇒ Mat3): ReprMat[U, Mat3]


Merge multiple sources. Picks elements randomly if all sources has elements ready.

emits when one of the inputs has an element available

backpressures when downstream backpressures

completes when all upstreams complete (This behavior is changeable to completing when any upstream completes by setting eagerComplete=true.)

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