public LinkedBuffer packDouble(double v, WriteSession session, LinkedBuffer lb)
            throws IOException
    {
        return writeByteAndLong(FLOAT64, Double.doubleToRawLongBits(v), session, lb);
    }
Simple wrapper around WriteSink with methods specific for MessagePacker

@author Alex Shvid
protostuff-msgpack/src/main/java/io/protostuff/MsgpackWriteSink.java