docs: public static final boolean parseBoolean(CharSequence cs, int beginIndex, int endIndex)
      {
          return 
                  endIndex - beginIndex == 4 &&
                  Character.codePointCount(cs, beginIndex, endIndex) == 4 &&
                  Character.toUpperCase(Character.codePointAt(cs, beginIndex)) == 'T' &&
                  Character.toUpperCase(Character.codePointAt(cs, beginIndex+1)) == 'R' &&
                  Character.toUpperCase(Character.codePointAt(cs, beginIndex+2)) == 'U' &&
                  Character.toUpperCase(Character.codePointAt(cs, beginIndex+3)) == 'E';
      }