lodash: Add native method overwrite detection and optimize bind for native bind. [jddalton]

Former-commit-id: d968957e494fb828df155d2f9b0d3faf24e38b5e

test/test.js

@@ -62,6 +62,14 @@
         skipTest(1)
       }
     });
+
+    test('avoids overwritten native methods', function() {
+      if (window.lodashBadKeys) {
+        notDeepEqual(lodashBadKeys.keys({ 'a': 1 }), []);
+      } else {
+        skipTest(1);
+      }
+    });
   }());
 
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