code: function SetResponse(model, args, isJSONGraph,
                                         isProgressive) {
  
      // The response properties.
      this._model = model;
      this._isJSONGraph = isJSONGraph || false;
      this._isProgressive = isProgressive || false;
      this._initialArgs = args;
      this._value = [{}];
  
      var groups = [];
      var group, groupType;
      var argIndex = -1;
      var argCount = args.length;
  
      // Validation of arguments have been moved out of this function.
      while (++argIndex < argCount) {
          var arg = args[argIndex];
          var argType;
          if (isArray(arg) || typeof arg === "string") {
              arg = pathSyntax.fromPath(arg);
              argType = "PathValues";
          } else if (isPathValue(arg)) {
              arg.path = pathSyntax.fromPath(arg.path);
              argType = "PathValues";
          } else if (isJSONGraphEnvelope(arg)) {
              argType = "JSONGs";
          } else if (isJSONEnvelope(arg)) {
              argType = "PathMaps";
          }
  
          if (groupType !== argType) {
              groupType = argType;
              group = {
                  inputType: argType,
                  arguments: []
              };
              groups.push(group);
          }
  
          group.arguments.push(arg);
      }
  
      this._groups = groups;
  }
docs: The set response is responsible for doing the request loop for the set
  operation and subscribing to the follow up get.
  
  The constructors job is to parse out the arguments and put them in their
  groups.  The following subscribe will do the actual cache set and dataSource
  operation remoting.
  
  @param {Model} model -
  @param {Array} args - The array of arguments that can be JSONGraph, JSON, or
  pathValues.
  @param {Boolean} isJSONGraph - if the request is a jsonGraph output format.
  @param {Boolean} isProgressive - progressive output.
  @augments ModelResponse
  @private