The functions unicode-string-not-greaterp and unicode-string-not-lessp compare the designated substrings of string1 and string2, similarly to cl:string-not-greaterp and cl:string-not-lessp but ignoring case using Unicode rules specified by style. The values of start1 and start2 default to 0, while the values of end1 and end2 default to nil.
The value of mismatch-index is the index where the strings mismatch (as an offset from the beginning of string1) if substring1 is not greater (or for unicode-string-not-lessp, not less) than substring2, or nil otherwise.
The current implementation only supports one style of comparison:
Compares each character of the string using the simple lowercase folding rules in Unicode 6.3.0.
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