if (obj != null && obj != Undefined.instance)
if (obj != null && obj != UniqueTag.NOT_FOUND)
    public Object get(String name, Scriptable start) {        System.err.println ("GET: "+name);        Object obj = prototype.get(name, start);        if (obj != null && obj != Undefined.instance)            return obj;        return super.get(name, start);    }