Merge several streams, taking elements as they arrive from input streams (picking from preferred when several have elements ready). A MergePreferredT has one Out port, one Preferred input port and 0 or more secondary In(Int32) ports.

Emits when one of the inputs has an element available, preferring a specified input if multiple have elements available

Backpressures when downstream backpressures

Completes when all upstreams complete (eagerComplete=false) or one upstream completes (eagerComplete=true)

Cancels when downstream cancels

public sealed class MergePreferred<T> : GraphStage<MergePreferredTMergePreferredShape>

[<SealedAttribute>]
type MergePreferred<'T> =  
    class
        inherit GraphStage<MergePreferredTMergePreferredShape>
    end