Re: [whatwg/dom] once() and on() async utilities for EventTarget (Issue #1038)

What's the actual difference? The thing the OP proposes is

> `EventTarget.once() returns a Promise that is resolved the next time the event is dispatched.

which sounds exactly like `first` from the proposal:

> `Observable#first()` returns a Promise that resolves when the first event is fired on an EventTarget

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