code: func (VarintObjectCodec) WriteObject(stream io.Writer, obj interface{}) error {
  	data, err := json.Marshal(obj)
  	if err != nil {
  		return err
  	}
  	var buf [binary.MaxVarintLen64]byte
  	b := binary.PutUvarint(buf[:], uint64(len(data)))
  	if _, err := stream.Write(buf[:b]); err != nil {
  		return err
  	}
  	if _, err := stream.Write(data); err != nil {
  		return err
  	}
  	return nil
  }
docs: // WriteObject implements ObjectCodec.