Re: [whatwg/dom] [Proposal] Add EventTarget.getEventListeners() (#412)

I don't think an opt-in new method would work (if the listener-adding code follow the same "contract" as the listener-reading code they can just use a helper, most use cases for `getEventListeners()` are about doing stuff with listeners you did not attach yourself), but what about an opt-out? I'd wager that _most_ event listeners exist to enable functionality and don't care one iota about encapsulation. For the ones that do, there could be something like `addEventListener(eventName, callback, {closed: true})` 

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