example-app - is removeBookFailure reducer correct?

[AdditionAddict]

Basically this SO post https://stackoverflow.com/questions/60417722/ngrx-handle-api-failure

Should line below be removed given it has no effect / should removeBook optimistically remove the book?
Happy to create PR whichever way

on(
    CollectionApiActions.addBookSuccess,
    CollectionApiActions.removeBookFailure, <-------------------
    (state, { book }) => {
      if (state.ids.indexOf(book.id) > -1) {
        return state;
      }
      return {
        ...state,
        ids: [...state.ids, book.id],
      };
    }
  ),

Describe any alternatives/workarounds you're currently using

Other information:

If accepted, I would be willing to submit a PR for this feature

[ x ] Yes (Assistance is provided if you need help submitting a pull request)
[ ] No

[timdeschryver]

This does seem weird.

I expect it to revert the removal of a book if the API call failed.
What is missing from the example app is the removal of the book in the collection when the removeBook action is dispatched.

The same counts for the addBook and addBookFailure actions.