code: private int getMaxStringSize() {
      Iced<?> maxSize = DKV.getGet(Key.make(WriterDelegate.class.getCanonicalName() + "_maxStringSize"));
      return (maxSize instanceof IcedInt) ? ((IcedInt) maxSize)._val : MAX_STR_LEN;
    }
docs: For unit tests only: allows to set maximum string size in a test for all nodes