Ignore non-optimistic action from different slice

[Buggytheclown]

Hi, nice work, checked a few packages for optimistic updates and i think that redux-optimistic-ui is the best! But i have a few point before we can start using it.

combineReducers({
  counter: optimistic(counter),
  currency: currency,
})

• i have optimistic counter state that react on 'INC', 'DEC' action types
• i have actions from web-socket to update currency, 'SET_CURRENCY ' action types

I don't want 'SET_CURRENCY ' action to trigger "@@optimist: Possible memory leak detected."

I want to have the same history after 'SET_CURRENCY' action

test('ignore action with no effect for optimistic reducer', t => {
  const enhancedReducer = optimistic(rootReducer);
  const begin0 = makeAction('INC', BEGIN, 0);
  const nonOpt0 = {type: 'SET_CURRENCY'};
  const state1 = enhancedReducer(undefined, begin0);
  const actual = enhancedReducer(state1, nonOpt0);
  const expected = {
    beforeState: {counter: 0},
    history: [begin0],
    current: {counter: 1}
  };
  t.deepEqual(actual, expected);
});

Before we will add action to the history we can check if it affect our state:

const nextState = reducer(state.current, action);
if(type !== COMMIT && type !== REVERT && nextState === state.current) {
    return state;
}