Re: [whatwg/fetch] Is a missing HeadersInit treated differently from an empty one? (#479)

So I should note that no matter what we do for records passing `[]` for a HeadersInit will unambiguously specify "no headers".  The real question is whether `{}` should have the same behavior as `[]`, and what behaviors `null` and `undefined` should have.

It sounds like you'd like `undefined` to mean "just copy the headers".  What about `null`?

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