Specifies that the comparison is forced to return either
k if the strings are equivalent but not strictly equal.
- iOS 2.0+
- macOS 10.5+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
- Core Foundation
You use this option for stability when sorting (for example, with
k specified “aaa” is greater than “AAA”).