code: function SerializeOperation(MapType) {
  		this.first = !serializeMap;
  
  		if(this.first) {
  			serializeMap = createSerializeMap(MapType);
  		}
  
  		this.map = serializeMap;
  		this.result = null;
  	}
docs: Holds the value of running serialize(), preserving the same map for all internal instances.