- Specialized IsClassOf for Number, Boolean, Arguments, and Function.

src/runtime.js

Index: src/runtime.js
===================================================================
--- src/runtime.js	(revision 518)
+++ src/runtime.js	(working copy)
@@ -352,8 +352,8 @@
 
   // Make sure the arguments list has the right type.
   if (args != null &&
-      %ClassOf(args) != 'Array' &&
-      %ClassOf(args) != 'Arguments') {
+      !%IsArrayClass(args) &&
+      !%IsArgumentsClass(args)) {
     throw %MakeTypeError('apply_wrong_args', []);
   }