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

More issues with multi-group support :-/.

```js
el.addEventListener("type", cb, { groups: ["a"] });

// Should presumably not add twice, just like if neither call had a groups option:
el.addEventListener("type", cb, { groups: ["a"] });

// But what should this do?
el.addEventListener("type", cb, { groups: ["a", "b"] });
```

This multi-groups piece is turning a simple feature into something not-so-simple, so now I am not as sure this feature is worth adding. (It's starting to fail on the cost/benefit axis discussed above.)

How important is multi-group support, do people think? Web developer perspectives appreciated.

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