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

> That is, if I had to implement this, I have no idea what I would actually need to do.

Ah, I see what the actual requirements are; I had missed them when I was looking over the commit somehow.

It is in fact not clear to me whether there's always a current realm when doing brand checks.  That would have to be pretty carefully audited.

I'd like to understand how this reduces complexity in specs, because this _definitely_ increases complexity in implementations as far as I can tell.  Can you point me to a specific example?  Is this just about making sure the specs in question can be polyfilled with 100% fidelity?  Quite honestly, my preferred answer there would be to expose the existing brand check to script.

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