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

Domains (in GTLD) are generally restricted from dashes in the 3rd and 4th
positions /^[A-z0-9][A-z0-9]--/ if this helps.  IDNA takes advantage of
this and was the catalyst.

On Mon, May 17, 2021, 4:01 PM Timothy Gu ***@***.***> wrote:

> @rmisev <https://github.com/rmisev> Indeed! As evident in UTS 46, the
> *CheckHyphens* boolean was first introduced to allow YouTube labels of
> form "r3---sn-apo3qvuoxuxbt-j5pe". (Previously it was always "true".) But I
> suppose the Unicode folks didn't consider the possibility of xn--, which
> now needs to be forbidden explicitly.
>
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