Bump to v4.1.0.

_getNative.js

@@ -0,0 +1,20 @@
+define(['./isNative'], function(isNative) {
+
+  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
+  var undefined;
+
+  /**
+   * Gets the native function at `key` of `object`.
+   *
+   * @private
+   * @param {Object} object The object to query.
+   * @param {string} key The key of the method to get.
+   * @returns {*} Returns the function if it's native, else `undefined`.
+   */
+  function getNative(object, key) {
+    var value = object == null ? undefined : object[key];
+    return isNative(value) ? value : undefined;
+  }
+
+  return getNative;
+});