@arina-ielchiieva - I'm still undecided; the Java technology is mature enough to handle national characters Up/Down case conversions, so why should we reimplement and add complexity ? Any benefit to the PR code (over using _toUpperCase()_ , etc) ? I compared the performance (by adding Stopwatch calls around the conversions) by converting the same string in a loop -- the PR code initially performs poorly, then becomes on par with the _toUpperCase()_ code (likely the JIT improves).
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