Characters greater than $þ (Character value 254) are not logically mapped between upper and lower case values. For these Characters, asUppercase and asLowercase return the receiver. In addition, case-insensitive pattern matching will treat these as unrelated characterers; for example,
(Character withValue: 353) equalsNoCase: (Character withValue: 352)
returns false.
This is related to bug 30911 for Characters between 127 and 254.
Last updated: 5/29/14