Re: [whatwg/url] More IDNA roundtrippability issues (Issue #760)

AFAIK WebKit uses the ICU library for IDNA. In ICU a check is added to report failure on `xn--` and `xn--ASCII-` labels after the ["If the label starts with “xn--”"](https://unicode.org/reports/tr46/#ProcessingStepPunycode) step. This check hasn't been added to UTS 46 standard yet. More info here:
* https://github.com/unicode-org/icu/pull/1234 
* https://unicode-org.atlassian.net/browse/ICU-21030

This explains, why these tests return an error in the WebKit, but success in the whatwg-url.

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