docs: static long lastTimestampInRow(final short metric_width,
                                   final KeyValue row) {
      final long base_time = Bytes.getUnsignedInt(row.key(), metric_width + 
          Const.SALT_WIDTH());
      final byte[] qual = row.qualifier();
      if (qual.length >= 4 && Internal.inMilliseconds(qual[qual.length - 4])) {
        return (base_time * 1000) + ((Bytes.getUnsignedInt(qual, qual.length - 4) & 
            0x0FFFFFC0) >>> (Const.MS_FLAG_BITS));
      }
      final short last_delta = (short)
        (Bytes.getUnsignedShort(qual, qual.length - 2) >>> Const.FLAG_BITS);
      return base_time + last_delta;
    }