Re: [fetch] Why are headers a special data-structure? (#154)

The reason there is ordering for `Headers` objects is that it is exposed in service workers and through iteration of `Headers` objects in general. Note that headers added after service workers cannot be observed other than on a server and the requirements on those are a bit muddy.

We could have a discussion among browsers if we could do something that is more optimized, but please open a distinct issue for that.

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