'αβγω'  asUppercase -> 'ΑΒΓΩ'
'ĥåçýджк' asUppercase "->  'ĤÅÇÝДЖК'
'abcäöüáéíýıijńǵȅȇȉ' asUppercase -> 'ABCÄÖÜÁÉÍÝIIJŃǴȄȆȈ'