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        public override int Encode(byte[] buffer, int offset)
        {
            long number = this.number;

            int written = offset;
            buffer[written++] = (byte)'i';
            
            if (number < 0)
            {
                buffer[written++] = (byte)'-';
                number = -number;
            }
            // Reverse the number '12345' to get '54321'
            long reversed = 0;
            for (long i = number; i != 0; i /= 10)
                reversed = reversed * 10 + i % 10;

            // Write each digit of the reversed number to the array. We write '1'
            // first, then '2', etc
            for (long i = reversed; i != 0; i /= 10)
                buffer[written++] = (byte)(i % 10 + '0');

            if (number == 0)
                buffer[written++] = (byte)'0';

            // If the original number ends in one or more zeros, they are lost
            // when we reverse the number. We add them back in here.
            for (long i = number; i % 10 == 0 && number != 0; i /= 10)
                buffer[written++] = (byte)'0';

            buffer[written++] = (byte)'e';
            return written - offset;
        }