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

> Events dispatched via JS won't be cancellable from `.first` and other promise-returning methods, as the microtask checkpoint is skipped because the stack isn't empty. This could become a bit of a gotcha.

fwiw this is a pretty big deal, especially now `EventTarget` is constructible, we'll see a lot more event dispatches from JS.

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