Takes up to n elements from the stream and returns a pair containing a strict sequence of the taken element and a stream representing the remaining elements. If n is zero or negative, then this will return a pair of an empty collection and a stream containing the whole upstream unchanged.

Emits when the configured number of prefix elements are available. Emits this prefix, and the rest as a substream

Backpressures when downstream backpressures or substream backpressures

Completes when prefix elements has been consumed and substream has been consumed

Cancels when downstream cancels or substream cancels

public static Source<Tuple<IImmutableList<TOut>, Source<TOut, NotUsed>>, TMat> PrefixAndTail<TOut, TMat>(
	this Source<TOut, TMat> flow,
	int n
)

[<ExtensionAttribute>]
static member PrefixAndTail : 
        flow : Source<'TOut, 'TMat> * 
        n : int -> Source<Tuple<IImmutableList<'TOut>, Source<'TOut, NotUsed>>, 'TMat>