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

Option 3 makes sense as a quick fix.

/cc @yuki3 for Blink binding questions about the map/set iterators not having the right prototype chain.

I personally would have preferred not to have a backing map/set at all, i.e. just keep the map/set data internal instead of indirecting it through another ES object. But that's a larger change. And if we fix this then it should be an unobservable change.

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