Re: [whatwg/url] Initialize the IgnoreInvalidPunycode flag when calling UTS 46 (Issue #821)

@socram8888 ,

As for the validation step: The validation step needs to prohibit unassigned code points when going from the Unicode form to the ASCII form, because their future normalization behavior isn't known and the operation depends on normalization.

If labels that are already in the ASCII form weren't subject to validation, round-trippability between the ASCII and Unicoode forms wouldn't be stable.

This does have the side effect that domains from the future don't work in old software, but that's not too much of a practical problem in browsers due to the update cycle. (The update cycle isn't immediate. E.g. Firefox's IDNA is on Unicode 15.1 instead of 16.0 right now, but it's not unbounded waiting.)

In any case, you are asking for a design change to IDNA that doesn't belong in the URL Standard.

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