new pjax in 3.19.x outputs js-code

compare latest LS with eg. 3.15.x, the following js-code is displayed in table header:

function (enumerable) { var arr = []; for (var i = enumerable.length; i--; arr.unshift(enumerable[i])) { } return arr; }

• see assets/packages/pjax
• index.php/admin/pluginhelper/sa/sidebody/plugin/statsPivotTable/method/actionIndex/surveyid/{sid}