Polyfills: Added Number.isInteger. See #10872.

src/polyfills.js

@@ -6,6 +6,19 @@ if ( Number.EPSILON === undefined ) {
 
 }
 
+if ( Number.isInteger === undefined ) {
+
+	// Missing in IE
+	// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isInteger
+
+	Number.isInteger = function ( value ) {
+
+		return typeof value === 'number' && isFinite( value ) && Math.floor( value ) === value;
+
+	};
+
+}
+
 //
 
 if ( Math.sign === undefined ) {
@@ -22,7 +35,7 @@ if ( Math.sign === undefined ) {
 
 if ( Function.prototype.name === undefined ) {
 
-	// Missing in IE9-11.
+	// Missing in IE
 	// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name
 
 	Object.defineProperty( Function.prototype, 'name', {
@@ -39,7 +52,7 @@ if ( Function.prototype.name === undefined ) {
 
 if ( Object.assign === undefined ) {
 
-	// Missing in IE.
+	// Missing in IE
 	// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
 
 	( function () {