Re: [heycam/webidl] State that by default all objects are created in the relevant realm of `this` (#135)

That seems not great to me. When you're in a background thread, you should be very explicit about what realm you're creating objects in. Just inheriting a default is not going to work out well in general, I think.

IMO it's better to just state the realm when creating the object, and rely on ambient defaults as little as possible---only for the most obvious of cases. We should not be trying to create more situations that have ambient defaults available in non-obvious ways.

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