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

@annevk rust-url fuzzing has found another test case for IDNA that doesn't round-trip: `http://a.xn--xn-----/`
| input | output | Live URL Viewer |
| --- | -- | -- |
| http://a.xn--xn-----/ | http://a.xn----/ | [link](https://jsdom.github.io/whatwg-url/#url=aHR0cDovL2EueG4tLXhuLS0tLS0v&base=YWJvdXQ6Ymxhbms=) |
| http://a.xn----/ | http://a.-/ | [link](https://jsdom.github.io/whatwg-url/#url=aHR0cDovL2EueG4tLS0tLw==&base=YWJvdXQ6Ymxhbms=)

Should we reopen this, or open a new issue?

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