504	Proposed Update UTS #46, Unicode IDNA Compatibility Processing	Closing Date: 2024.07.02
Status:	Closed
Originator:	UTC
Informal Discussion:	Unicode Mail List (Join)
Formal Feedback:	Contact Form
Resolution:	The UTS will be updated with final content and published together with Unicode 16.0.

Description of Issue:

• A number of characters that were disallowed before are now ignored, mapped, or (in one case) valid. In xn-- Punycode labels, characters with Status ignored and mapped are still not valid. The affected characters had been disallowed because of differences between IDNA2003 data and UTS #46 principles. This is no longer necessary, and caused unnecessary complications. For details see Section 6 Step 3: Specify the base exclusion set.
• In Section 4, Processing, if the label starts with “xn--”, and the conversion from Punycode yields either an empty label or an all-ASCII label, then an error is now recorded, consistent with IDNA2008.
• In the test data file, there is a small addition to the syntax: "" means an empty string. There are also other test data corrections and improvements. For details see Section 8, Conformance Testing, Migration.
• Draft updated 2024-07-16.

 

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