From b8f81704884262c1061ce69921e9d898a312ed2d Mon Sep 17 00:00:00 2001
From: Jordan Harband <ljharb@gmail.com>
Date: Thu, 3 Dec 2015 23:57:22 -0800
Subject: [PATCH] [Fix] In IE 6, `window.external` makes `Object.keys` throw.

---
 es5-shim.js            | 3 ++-
 tests/spec/s-object.js | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/es5-shim.js b/es5-shim.js
index 0858e171..143ae056 100644
--- a/es5-shim.js
+++ b/es5-shim.js
@@ -919,7 +919,8 @@ var blacklistedKeys = {
     $frames: true,
     $frameElement: true,
     $webkitIndexedDB: true,
-    $webkitStorageInfo: true
+    $webkitStorageInfo: true,
+    $external: true
 };
 var hasAutomationEqualityBug = (function () {
     /* globals window */
diff --git a/tests/spec/s-object.js b/tests/spec/s-object.js
index 0ec804ee..7bd4ea0d 100644
--- a/tests/spec/s-object.js
+++ b/tests/spec/s-object.js
@@ -140,7 +140,7 @@ describe('Object', function () {
         ifWindowIt('can serialize all objects on the `window`', function () {
           var has = Object.prototype.hasOwnProperty;
           var windowItemKeys, exception;
-          var blacklistedKeys = ['window', 'console', 'parent', 'self', 'frame', 'frames', 'frameElement'];
+          var blacklistedKeys = ['window', 'console', 'parent', 'self', 'frame', 'frames', 'frameElement', 'external'];
           if (supportsDescriptors) {
               Object.defineProperty(window, 'thrower', { configurable: true, get: function () { throw new RangeError('thrower!'); } });
           }