Re: [heycam/webidl] Add [[PlatformBrand]] internal slot to all platform objects (#97)

The other thing that would be useful here is some shorthands around it. When you check against the list of platform brands, there's a difference if the matched  value is first in the list or somewhere else (or last and somewhere else, depending on order).

E.g., in DOM we sometimes want to match DocumentFragment, but not ShadowRoot (a subclass).

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