[Robustness] ensure main export callBinds

index.js

@@ -1,16 +1,17 @@
 'use strict';
 
+var callBind = require('call-bind');
 var define = require('define-properties');
 var RequireObjectCoercible = require('es-abstract/2020/RequireObjectCoercible');
 
 var implementation = require('./implementation');
 var getPolyfill = require('./polyfill');
-var polyfill = getPolyfill();
+var polyfill = callBind(getPolyfill());
 var shim = require('./shim');
 
 var boundShim = function at(array, index) {
 	RequireObjectCoercible(array);
-	return polyfill.call(array, index);
+	return polyfill(array, index);
 };
 define(boundShim, {
 	getPolyfill: getPolyfill,