Re: [whatwg/dom] Add a way to identify Abort errors originating from controllers (Issue #1033)

If you have a direct reference to the signal you might. You often do not have a reference to the signal which means you can't check `err === signal.reason` or `signal.aborted`.

Think "I'm instrumentation that needs to decide if an error is really exceptional and I need to wake up someone in the middle of the night or I'm just cancellation which I will happily ignore".

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