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

I guess here's my real concern.  If the `Response` constructor just took three arguments there, a `status`, `statusText`, and `HeadersInit`, then passing nothing would be exactly equivalent to passing `{}` for the `HeadersInit`, per IDL spec.  But because the three are packaged up in a `ResponseInit` dictionary, suddenly passing nothing for the `HeadersInit` _can_ be different from passing `{}` (arguably a bug in IDL), and fetch in fact gives them different behavior...

This dependency on whether arguments are passed individually or in a dictionary is deeply unfortunate from my point of view.

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