Re: [heycam/webidl] Dictionary types being nullable doesn't make sense (#967)

> one thing bz mentions there that null always means empty dictionary, but I'm not sure if that's applicable to a dictionary in a union as well.

It is. Note step 3 in <https://heycam.github.io/webidl/#es-union>, where if the JS value is `null` or `undefined`, and the union contains a dictionary type, the JS value gets converted into the dictionary type.

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