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

There is test coverage for this already in `resources/toascii.json`:
```json
  {
    "comment": "Invalid Punycode (contains non-ASCII character)",
    "input": "xn--tešla",
    "output": null
  }
```
Per https://wpt.fyi/results/url/toascii.window.html Chromium-based browsers have some issues there for `<a>` and `<area>`, but otherwise things seem to be in order.

Closing this therefore, but please comment if my analysis was lacking somehow.

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