Extends action doesn't work correctly for objects that can be created without the new keyword, like Date and Number.

Here is a test case:
 
Foo = function () {
  trace (this);
  super (1983, 11, 9);
  trace (this);
};
 
asm {
  push "Foo"
  getvariable
  push "Date"
  getvariable
  extends
};
 
var a = new Foo ();
trace (a);
 
loadMovie ("FSCommand:quit", "");