(from old email on the idna-update list, slightly updated) Pluses for IDNA2008 + Major improvement in updating to Unicode 5.2 + Major improvement in making process of updating to future Unicode versions mostly-automatic
+ Significant improvement in allowing needed sequences (combining marks at end of bidi label). - Major interoperability issue with local mappings+ Significant improvements to the BIDI rules + Improvements in user expectations for special cases: sigma, sharp s, joiners + Improvement in clarifying that what people register is the unmapped form. Minuses for IDNA2008 - Major interoperability/security issue with special cases, URLs going to different places - Significant interoperability issue by not continuing 2003 mappings - Significant increase in complexity, reducing the likelihood of correct implementation - Misleading information in Rationale (if anyone reads it). - Small interoperability issue by excluding symbols, punctuation - More fragile in that future Unicode versions require a manual step to avoid instabilities - No requirements for stability: that all labels valid under VX (>= 2008) must also be valid under all future versions - No process for CONTEXTO that guarantees stability |
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