IsCased(X) is true when isLowercase(X) is false, or isUppercase(X) is false, or isTitlecase(X) is false.

• Any string X for which isCased(X) is true contains at least one character that has a case mapping other than to itself.
• For example, isCased("123") is false because all the characters in "123" have case mappings to themselves, while isCased("abc") and isCased("A12") are both true.
• The derived binary property Changes_When_Casemapped is listed in the data file DerivedCoreProperties.txt in the Unicode Character Database.