docs: private static byte[] convertToByteArray(CharSequence charSequence) {
          checkNotNull(charSequence);
  
          byte[] byteArray = new byte[charSequence.length() << 1];
          for(int i = 0; i < charSequence.length(); i++) {
              int bytePosition = i << 1;
              byteArray[bytePosition] = (byte) ((charSequence.charAt(i)&0xFF00)>>8);
              byteArray[bytePosition + 1] = (byte) (charSequence.charAt(i)&0x00FF);
          }
          return byteArray;
      }