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

I assume engines would still keep supporting them as abstractions, e.g. as C++ ordered maps. Both Web IDL maplikes and JS engine Maps could keep C++ ordered maps, and you'd create a MapIterator from such C++ ordered maps.

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