Re: [whatwg/dom] Removing event listeners through an identifier (#208)

Could `addEventListener` work similar to how `setTimeout` and `clearTimeout` works? For example, with `setTimeout`, `setInterval`, `requestAnimationFrame`, it's easier for apps to keep track of an `id` rather than a function which needs be called later on. For example:

```
var id = obj.addEventListener('click', ...);
document.clearEventListener(id);
```

Using a id rather than holding onto references to the handler could also reduce the potential for memory leaks.

What would be great is if the returned `id` could be global and not specific to the object the handler was added to. I used `document.clearEventListener` just for an example. Additionally, whatever removes the listener could accept one id, or an array of ids.


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