Re: [whatwg/dom] Allow postMessage-ing AbortSignal (#948)

Just to offer a different perspective on this... in Node.js (which is, of course, a different environment than browsers) we have more of a notion of objects that can be shared across workers -- much like `SharedArrayBuffer` but for other host objects we provide. In that environment, we actually *could* actually have two different `AbortSignal` objects (one in each thread) sharing the same underlying backend such that `signal.aborted === signal.aborted`. (It's not implemented this way *today*... but we *could*).


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