Bump to v4.0.0.

isObject.js

@@ -0,0 +1,34 @@
+define([], function() {
+
+  /**
+   * Checks if `value` is the [language type](https://es5.github.io/#x8) of `Object`.
+   * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
+   *
+   * @static
+   * @memberOf _
+   * @category Lang
+   * @param {*} value The value to check.
+   * @returns {boolean} Returns `true` if `value` is an object, else `false`.
+   * @example
+   *
+   * _.isObject({});
+   * // => true
+   *
+   * _.isObject([1, 2, 3]);
+   * // => true
+   *
+   * _.isObject(_.noop);
+   * // => true
+   *
+   * _.isObject(null);
+   * // => false
+   */
+  function isObject(value) {
+    // Avoid a V8 JIT bug in Chrome 19-20.
+    // See https://code.google.com/p/v8/issues/detail?id=2291 for more details.
+    var type = typeof value;
+    return !!value && (type == 'object' || type == 'function');
+  }
+
+  return isObject;
+});