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

> Hmm, talking to @tschneidereit recently he implied it would decrease the complexity, especially given Gecko's multi-globals implementation. For example, it allows us to entirely avoid worrying about current realm vs. relevant realm! It also enables self-hosting of built-ins in JavaScript more easily.

What we were discussing was the Streams spec, where our implementation would be vastly simpler if one couldn't create a reader in realm A to target a stream in realm B. We wouldn't need to do all the unwrapping and checking for dead wrappers in that case.

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