public void Subscribe <C>(C callback, ISubscription subscription)
where C : IFlowCallback <TTarget>
{
var myCallback = new Callback <C>(callback, subscription, Func);
Upstream.Subscribe(myCallback, subscription);
}
public static void Subscribe <X>(this IFlow <X> @this)
{
@this.Subscribe(new EmptyFlowCallback <X>(), new Subscription());
}