code: function init( { customEnhancer, customMiddleware = {} } = {} ) {
  	const middle = withMiddleware( customMiddleware );
  	const create = customEnhancer ? customEnhancer( middle ) : middle;
  
  	store = create( reducer, reducer( undefined, { type: '@@INIT' } ) );
  	return store;
  }
docs: Note: this function has the unexpected side effect of modifying the `store` export. In order to maintain behaviour for consumers, it's being kept this way, but beware this is not a pure function.