Re: [whatwg/url] Disallow comma in hosts (#390)

@annevk correct me if I’m wrong, but that doesn’t use the #list syntax, so is it legal to coalesce? Sorry, having trouble tracking across the various specs, but https://fetch.spec.whatwg.org/#http-new-header-syntax says no?

Alternatively, should (and of course this is idealistic should, since that horse long left the barn) ACAO have been specified as quoted, if the values of a host were confusible with concatenation? Is this something we should be more careful about with all new header syntaxes?

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