Change style of parameter type declaration to make sure it transformAttributes handles it correctly. Objects were still parsed as string, resulting in "[Object object]"

api/js/etemplate/Et2Select/Et2WidgetWithSelectMixin.ts

@@ -75,7 +75,7 @@ export const Et2widgetWithSelectMixin = dedupeMixin((superclass) =>
 				 * Will be found automatically based on ID and type, or can be set explicitly in the template using
 				 * <option/> children, or using widget.select_options = SelectOption[]
 				 */
-				select_options: Object,
+				select_options: {type: Object},
 			}
 		}