Focusing in on `ReplaySubject.Subscription`.

replay_subject_focus.swift

final class ReplaySubject<Output, Failure: Error>: Subject  { /* … */ }

extension ReplaySubject {
	final class Subscription<Subscriber: Combine.Subscriber>: Combine.Subscription
		where Subscriber.Input == Output, Subscriber.Failure == Failure {

		init(subscriber: Subscriber) { /* … */ }

		func request(_ demand: Subscribers.Demand) { /* … */ }

		func cancel() { /* … */ }

		func forward(completion: Subscribers.Completion<Failure>) { /* … */ }

		func forward(value: Output) { /* … */ }
	}
}