code: function (suggestions) {
          var that = this,
              shouldRestrict = that.shouldRestrictValues(),
              label = that.getFirstConstraintLabel();
  
          $.each(suggestions, function (i, suggestion) {
              if (!suggestion.unrestricted_value) {
                  suggestion.unrestricted_value = shouldRestrict ? label + ', ' + suggestion.value : suggestion.value;
              }
          });
      }
docs: Fills suggestion.unrestricted_value property