Bump to v3.9.0.

lang/isNative.js

@@ -13,6 +13,9 @@ var objectProto = Object.prototype;
 /** Used to resolve the decompiled source of functions. */
 var fnToString = Function.prototype.toString;
 
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
+
 /**
  * Used to resolve the [`toStringTag`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.prototype.tostring)
  * of values.
@@ -21,8 +24,8 @@ var objToString = objectProto.toString;
 
 /** Used to detect if a method is native. */
 var reIsNative = RegExp('^' +
-  escapeRegExp(objToString)
-  .replace(/toString|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
+  escapeRegExp(fnToString.call(hasOwnProperty))
+  .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
 );
 
 /**