.isAtMost(bucketsOf(referenceMap));
  }

  @J2ktIncompatible
  @GwtIncompatible // reflection
  private static int bucketsOf(HashMap<?, ?> hashMap) throws Exception {
    Field tableField = HashMap.class.getDeclaredField("table");
    tableField.setAccessible(true);
    Object[] table = (Object[]) tableField.get(hashMap);
    // In JDK8, table is set lazily, so it may be null.
    return table == null ? 0 : table.length;
  }

            }
        }

        private static void attachFactoryIdToImplType(Class<?> implClass, int id) {
            try {
                Field factoryField = implClass.getDeclaredField(FACTORY_ID_FIELD);
                factoryField.setAccessible(true);
                factoryField.set(null, id);
            } catch (Exception e) {