Bump to v4.0.0.

isArray.js

@@ -0,0 +1,29 @@
+define([], function() {
+
+  /**
+   * Checks if `value` is classified as an `Array` object.
+   *
+   * @static
+   * @memberOf _
+   * @type Function
+   * @category Lang
+   * @param {*} value The value to check.
+   * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+   * @example
+   *
+   * _.isArray([1, 2, 3]);
+   * // => true
+   *
+   * _.isArray(document.body.children);
+   * // => false
+   *
+   * _.isArray('abc');
+   * // => false
+   *
+   * _.isArray(_.noop);
+   * // => false
+   */
+  var isArray = Array.isArray;
+
+  return isArray;
+});