Re: [fetch] Can headers ordering be lessened? (#189)

The vast majority of Headers objects will have ~10 headers or less.  Simple lists are typically faster for those numbers of items than hash tables, etc.  The overhead of the heavier data structure outweighs any benefit from the better algorithmic complexity.

I defer to @annevk about dropping a content exposed behavior like strict ordering, but it does not seem worth making a change here to me.

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