Re: [whatwg/url] DNS (and other naming systems) vs the host parser (#397)

A way out here mentioned in https://bugzilla.mozilla.org/show_bug.cgi?id=1184059#c29 might be that we have a separate "DNS domain" definition which is effectively a further validation on the output of the host parser (if it is a domain) that allows

* what https://tools.ietf.org/html/rfc1034 as modified by https://tools.ietf.org/html/rfc1123#section-2 allows
* underscores
* hyphens in more places?

As this definition is mainly needed by various networking standards, it doesn't necessarily have to live in the URL Standard. Fetch could be a place, but perhaps filing some issues against the relevant standards that have a dependency on the "broken" concept could also result in some action.

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