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

The [ES MapIterator algo](https://tc39.es/ecma262/#sec-createmapiterator) just (1) checks the object has a [[MapData]], (2) creates a closure that iterates over the [[MapData]] and yields IterResults, and then (3) makes an iterator from that closure with `%MapIteratorPrototype%` as the prototype. As far as I can tell I can just copy that, swapping step 1 for the current security/coherence checks in WebIDL, swapping step 2 for an algo that iterates over the Infra map (but is otherwise identical), and then invokes step 3 exactly as currently written. That should still produce an iterator with the correct proto and the same observable iteration behavior, just iterating over a different impl-internal data structure.

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