Re: [url] "A query must be zero or more URL units. " (#95)

HTML says 

> A URL is a valid URL if it conforms to the authoring conformance requirements in the WHATWG URL standard. [URL]

I think it used to have normative authoring restrictions based on the document's encoding, but I don't see it anymore. Though I could live with this being done in the HTML spec.

I think it's still a good idea to have multiple levels of conformance requirements. Not mentioning the issues because we ban non-utf-8 means that more people will be aware that the issues exist at all. In practical terms, I want validators to whine both about the wrong document encoding and pin-point the places where it is a problem.

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