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

> They did in Gecko and, I believe, WebKit. They arguably did in Blink, although via the abstraction that is V8 extras, which you might not count.

WebKit implements Streams at the browser engine (WebCore) level, not the JS engine (JavaScriptCore) level. We do try to make them look more like JS builtins than other bindings do, though perhaps not with full fidelity. This is in part because the having an ECMA add-on spec is unusual and mildly confusing; and in part because nothing else is implemented as a DOM binding that's supposed to look like a JS builtin.

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