title: Store not updating in IE11 (react redux)
body: <p>in IE 11 I can't update my store.
  First time it add data, but next time, when I try update it not working.</p>
  
  <p>I try use polyfill</p>
  
  <pre><code>import Immutable from 'immutable'
  const objectAssign = require('object-assign');
  const initialUserState =
  {
  
  }
  ;
  const BackupReducer = function(state = initialUserState, action) {
     //console.log('actiondata in reducer:' + action.data + action.type);
  
    switch(action.type) {
  
    case 'GET_BACK_LIST':
           return objectAssign({}, state, { backups: action.data });
   break;
  </code></pre>
  
  <p>but it not helps:
  in console I see:</p>
  
  <p><a href="https://i.stack.imgur.com/U8Dsh.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/U8Dsh.png" alt="enter image description here"></a></p>