Make bound functions have poisoned .caller and .arguments.

src/v8natives.js

Index: src/v8natives.js
diff --git a/src/v8natives.js b/src/v8natives.js
index de80067866b3e95d878b9452d7e0eb8fd9ac202c..337349cad944b7443e36d01b4054c6b09c730a17 100644
--- a/src/v8natives.js
+++ b/src/v8natives.js
@@ -1520,6 +1520,8 @@ function FunctionBind(this_arg) { // Length is 1.
     throw new $TypeError('Bind must be called on a function');
   }
   var boundFunction = function () {
+    // Poison .arguments and .caller, but is otherwise not detectable.
+    "use strict";
     // This function must not use any object literals (Object, Array, RegExp),
     // since the literals-array is being used to store the bound data.
     if (%_IsConstructCall()) {