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

The only mention of duplicate headers I found in [5.6 CORS-preflight fetch](https://fetch.spec.whatwg.org/#cors-preflight-fetch). It might be nice to say that duplicates are allowed somewhere.

So it wasn't clear to me that duplicates are possible. I had a feeling that what I'm asking is an 'out-of-place' question since I'm still quite new to reading specs. I guess what I'd really like to know more about is the thought process that lead up to the way thing sare, because without it I keep finding myself asking: Why was this designed in that way. Does that make sense? Should I just look at the git history, or are there other better places to understand why the spec is like it is?

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