@Override
    public int codePointCount(CharSequence seq) {
      return Character.codePointCount(seq, 0, seq.length());
    }
Return the index within <code>buf[start:start+count]</code> which is by <code>offset</code>
 code points from <code>index</code>.
linguistics/src/main/java/com/yahoo/language/simple/kstem/CharacterUtils.java