@Override
        public String toJson()
        {
            if (Float.isNaN(value) || Float.isInfinite(value))
            {
                return "null";
            }
            else
            {
                return Float.toString(value);
            }
        }
Implementation of missing value impl for float in msgpack-core

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