Re: [whatwg/url] can't parse urls starting with xn-- (#438)

> A fix is being proposed for tr46.

The fix proposed for `UTS #46` is to detect "xn--" and "xn--ASCII-" as errors in a way that's equivalent with what IDNA2008 does. See https://www.unicode.org/L2/L2020/20240-utc165-properties-recs.pdf item F7 (on page 8).

More generally, the strategy is to report errors but still produce output (unless, for example, the Punycode string is ill-formed and thus not decodable), because different users/callers may ignore different types of errors.

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