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Date/Time: Fri Jan 15 16:41:35 CST 2021
Name: Charlotte Buff
Report Type: Error Report
Opt Subject: UAX #44: Incorrect Statements about CCC
In UAX #44 (Unicode Character Database), towards the end of section 5.10.1 (Character Property Invariants), the following is written: »All characters other than those of General_Category M* are guaranteed to have Canonical_Combining_Class=0. Currently it is also true that all characters other than those of General_Category Mn have Canonical_Combining_Class=0. However, the more constrained statement is not a guaranteed invariant; it is possible that some new character of General_Category Me or Mc could be given a non-zero value for Canonical_Combining_Class in the future.« The second and third sentences of that paragraph are inaccurate: • There exist several characters with General_Category=Mc whose CCC is not 0. • Characters with General_Category=Me cannot be given a CCC value other than 0, as this is forbidden by property value stability policy.
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