Re: [whatwg/dom] Owned weak event listener to prevent memory leak (using EventListenerOptions) (#243)

@annevk I'm not sure what you mean. If one wants to implement
```
document.addEventListener('click', ev => { ... }, { owner: popupElem }); 
```
He has to reference `popupElem` _strongly_ somewhere, and this effectively prevent `popupElem` being GC'd when it is no longer needed elsewhere.

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