Re: [whatwg/xhr] setRequestHeader behavior doesn't seem to match implementations (#108)

Current thinking, assuming the goal is maximum compatibility with deployed rather browsers, rather than a coherent whole:

* Add a space to *combine*'s `,`. Perhaps rename it to *legacy combine* to indicate this is only for old stuff.
* Add a *legacy space flag* to *sort and combine* and *combined value*, that does exactly what you think it might do. (Potentially we do that for *combine* as well, so we can use it for `Access-Control-Request-Headers` and others.)

Updating tests first...

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