Re: [whatwg/dom] Improving ergonomics of events with Observable (#544)

@appsforartists Nitpick, but a `Subject` should not retain its current value. Rather than having a `Memoryless` subject, I think it should be the other way around: having a `Subject` that can retain its latest value, like `BehaviorSubject` in `rxjs`. Adding functionality on top of the common base, instead of removing it.

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