code: function(obj, clone) {
          var thisObj = this;
          thisObj.itsa_emptyObject();
          if (clone) {
              deepCloneObj(obj, thisObj, true);
          }
          else {
              thisObj.itsa_merge(obj);
          }
          return thisObj;
      }
docs: Sets the properties of `obj` to the instance. This will redefine the object, while remaining the instance.
  This way, external references to the object-instance remain valid.
  
  @method itsa_defineData
  @param obj {Object} the Object that holds the new properties.
  @param [clone=false] {Boolean} whether the properties should be cloned
  @chainable