Re: [whatwg/url] Double-encoded IDNA labels don't roundtrip (#603)

I think double-encoded labels must be considered invalid. I see two ways to achieve this:
1. Set *CheckHyphens* to true
2. Or modify [UTS 46 validity criteria](https://www.unicode.org/reports/tr46/#Validity_Criteria): add following criteria (suppose after 3):
   "If *CheckHyphens* = false, the label must not begin with `xn--`"

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