code: protected void checkState(InitializedState minState, InitializedState maxState) {
          PreconditionUtil.verify(initializedState.ordinal() >= minState.ordinal(), "not yet initialized, cannot yet be called");
          PreconditionUtil
                  .verify(initializedState.ordinal() <= maxState.ordinal(), "already initialized, cannot be called anymore");
      }
docs: Ensures the {@link ModuleRegistry#init(ObjectMapper)}
  has not yet been called.