Re: [whatwg/fetch] Use `,` rather than `, ` for combine operation (#207)

I'm not sure that consistency is a good thing, here.

While you might be able to get alignment between client-generated headers over time (because there are relatively few codebases), it's not really practical to think that will happen for server-generated ones -- or even for those generated by intermediaries (e.g., request headers inserted by a forward or reverse proxy).

However, if clients *mostly* send it with the spacing you specify, people will inevitably write code to expect that behaviour, and things will break in weird ways.

What do you actually improve by going to this level of detail, and is it worth the risk noted above? 

I'm not against this strongly, just wondering why it's necessary.

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