private void appendString(StringBuilder sb, Value value)
        {
            if (value.isRawValue())
            {
                sb.append(value.toJson());
            }
            else
            {
                sb.append(value.toString());
            }
        }
Implementation of the msgpack mutable array

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