svoid test_recursiveObjectSizeWithManagedObjects() {
  new RecursiveObjectSize ros;
  ManagedIntObjects_v1 mo = new(1024*1024);
  long size = print(size := ros.recurse(mo));
  assertTrue(ros.hasSeen(mo.mem));
  assertTrue(size > 1024*1024*4);
  assertTrue(size < 1024*1024*5);
}