function isDirtyCacheEntry(reactorState, cacheEntry) {
	  var storeStates = cacheEntry.get('storeStates');

	  // if there are no store states for this entry then it was never cached before
	  return !storeStates.size || storeStates.some(function (stateId, storeId) {
	    return reactorState.getIn(['storeStates', storeId]) !== stateId;
	  });
	}
@param {ReactorState} reactorState
@param {CacheEntry} cacheEntry
@return {boolean}