Re: [fetch] `user-agent` header control (#37)

> If we allow setting it to any value and effectively replace anything the user agent would set we should probably make it a parameter of RequestInit as the supplied headers argument combines with existing headers (and never replaces). So e.g.

Hmm, I'm not sure I necessarily agree. It seems a straightforward extension to say that headers provided by the RequestInit overwrite default headers. What do you think would be confusing about allowing User-Agent to be set through the normal mechanisms?

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