使用'Immutable'存储库时，多次使用CombineReducers会引发错误

Question

当我多次使用redux-immutable的CombineReducers时，如下所示，我收到一条错误消息：“ Reducer在先前状态下发现意外的键“ child1”。期望找到已知的reducer之一键。”

import {combineReducers} from 'redux-immutable'
import * as Immutable from 'immutable'

const CHILD_1_REDUCER = (state=Immutable.Map(), action) => state;
const CHILD_2_REDUCER = (state=Immutable.Map(), action) => state;

const PARENT_REDUCER = combineReducers({
  child1: CHILD_1_REDUCER,
  child2: CHILD_2_REDUCER
});

const ROOT_REDUCER = combineReducers({
  parent: PARENT_REDUCER
});

如何在combineReducers商店中多次使用Immutable？