static <A> A nuLike proxy(Class<A> intrface, final O target) {
  if (target == null) null;
  if (isInstance(intrface, target)) ret (A) target;
  ret (A) java.lang.reflect.Proxy.newProxyInstance(intrface.getClassLoader(),
    new Class[] { intrface },
    new InvocationHandler {
      public O invoke(O proxy, Method method, O[] args) {
        ret call(target, method.getName(), unnull(args));
      }
    });
}

static <A> A proxy(O target, Class<A> intrface) {
  ret proxy(intrface, target);
}