Re: [heycam/webidl] Does a non-nullable and non-required dictionary member of interface type make sense? (#176)

Looks like Blink's RequestInit doesn't use an IDL dictionary but some custom handling, so it didn't show up. But because HeadersInit is a union type that includes a dictionary type, null will presumably be treated as that dictionary per https://heycam.github.io/webidl/#es-union?

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