Re: [heycam/webidl] Introduce a SameRealmBrandCheck extended attribute (#718)

We definitely should review all the places that use "implements" if we decide that this is a feature we want; I haven't done that yet. There are a bunch of places that use "object implements an interface that ...", which we may want to distinguish somehow. We do need to be careful, though, not to expose any feature that will allow cross-realm brand checking—any single one would defeat the point of this feature.

I do think it would be somewhat strange to silently key this off "is defined in a module", but then again, that may end up being the de facto situation anyway. We may wish to add some guidance about when to use this feature.

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