reducer add to object in object array

gistfile1.txt

 case GET_USERS:
        return [...action.payload];
        //payload looks like: [{id: 1, name: blah, age: 30}{id: 2, name: blub, age: 20}]
  case GET_USER_PROPS:
      //payload looks like: {prop1: foo, prop2: bar, ...}
      //i tried this, with lodash merge, but as expected that creates a new object, whereas i want an array of objects.
      return merge({}, state, action);