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

That's only if the union type does not include a nullable type, due to step 1:

> If the union type includes a nullable type and V is null or undefined, then return the IDL value null.

Looking at https://heycam.github.io/webidl/#es-dictionary I don't think nested dictionaries are a concern.

So I think I agree that we can disallow explicitly nullable dictionaries.

Is `(DOMString? or MyDict)` disallowed as well? I guess it should be?

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