`Publisher.cher` without `autoconnect`ing.

cher_sans_autoconnect.swift

extension Publisher {
	func cher() -> Publishers.Multicast<Self, PassthroughSubject<Output, Failure>> {
		multicast(PassthroughSubject.init) /// (1) Keen readers might be asking why we didn’t reach for
		/// `CurrentValueSubject` here. The reason is two-fold, we’d then need to consider what its initial value
		/// would be, and that’d do more than the plain ol’ `share` operator in that it’d _replay_ values to future
		/// subscribers (before any completions), which, is what we’ll tackle soon!
	}
}