Re: [whatwg/dom] Define a 'CancelationController' and 'CancelationSignal' interface. (#434)

@annevk as i said, it is solved, just not in a generic way - and the committee isn't interested (sadly) in solving it in a generic way. The method already exists - hosts can check for the presence of internal slots, and do whatever they want. They can even create their own internal slots and check for the presence of those.

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