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Checks whether str is in Unicode normalization form form, which can be any of the four values :nfc, :nfd, :nfkc, or :nfkd. The default is :nfc.
If the string is not in a Unicode Encoding, then an Exception is raised. For details, see String#unicode_normalize.
"a\u0300".unicode_normalized?        #=> false
"a\u0300".unicode_normalized?(:nfd)  #=> true
"\u00E0".unicode_normalized?         #=> true
"\u00E0".unicode_normalized?(:nfd)   #=> false
                                     #=> Encoding::CompatibilityError raised
               static VALUE
rb_str_unicode_normalized_p(int argc, VALUE *argv, VALUE str)
    return unicode_normalize_common(argc, argv, str, id_normalized_p);

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