public IAsyncEnumerator <T> GetAsyncEnumerator(CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
return(new SinkQueueAsyncEnumerator <T>(_source
.Via(cancellationToken.AsFlow <T>(cancelGracefully: true))
.ViaMaterialized(KillSwitches.Single <T>(), Keep.Right)
.ToMaterialized(thisSinkQueue, Keep.Both)
.Run(_materializer),
cancellationToken));
}