Re: [whatwg/webidl] Are operations on the `[[BackingMap]]` and `[[BackingSet]]` page-hookable? And if not, why not? (#254)

> is there something I'm missing preventing us from just copying over the iterator algos, too?

I'm not quite sure what you have in mind, so the following might not apply, but the main observable constraint is that

```js
maplike[Symbol.iterator]().__proto__ === (new Map())[Symbol.iterator]().__proto__
```

I'm not sure how to do that if we just copy a bunch of stuff over.

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