Re: [heycam/webidl] Fix internal methods that only target platform objects w/ indexed/named props (#202)

They do offer more features, yes. But if you take classical inheritance, you see the same pattern going on, no?

If `Cat` is a subclass of `Animal`, it's to add more feature to the the `Cat` class, such as the `.meow()` method. Yet cats are a (proper) subset of animals.

Similarly, when we currently say in the spec "all platform objects," this includes legacy platform objects, right? If we agree that this is what we want (and I think we do), we don't really need to agree on how that translates in set theory terminology for me to be able to move ahead with it.


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