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

Gut feeling based on absolutely nothing is that it should be OK to align this without causing web compatibility problems. I may have to eat those words of course.. :p but I have rarely seen scripts setting same value multiple times and relying on concatenation. On the other hand, I think we should look at how HTTP does things and what common implementations do with list headers the browser sends - for consistency and aesthetic reasons. AFAIK HTTP says white-space is optional but if it's commonly implemented I could support making it mandatory..

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