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

In practice that would require that engines support a MapData/SetData existing outside of a Map/Set, right?  Right now those are just spec abstractions, not actual things that the gc needs to know about as separately-allocated objects, for example.

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