int bytes() {
        int bytes = 4 + values.size();
        for (int i = 0; i < values.size(); i++) {
            bytes += get(i).bytes();
        }
        return bytes;
    }
Determine the number of bytes needed to store this value
sequence when encoded into a buffer

@return number of bytes needed for encoding this value sequence
jrt/src/com/yahoo/jrt/Values.java