| 
                     | 
    ⇢ | 
                                 
                2
             
             | 
    BaseCollection::offsetGet() added | 
| 
                     | 
    ⇢ | 
                                 
                2
             
             | 
    BaseCollection::offsetSet() added | 
| 
                     | 
    ⇢ | 
                                 
                1
             
             | 
    BaseCollection::offsetUnset() added | 
| 
                     | 
    ⇢ | 
                                 
                1
             
             | 
    BaseCollection::offsetExists() added | 
| 
                                 2 
             | 
    ↛ | 
                     | 
    Collection::offsetGet() removed | 
| 
                                 2 
             | 
    ↛ | 
                     | 
    Collection::offsetSet() removed | 
| 
                                 1 
             | 
    ↛ | 
                     | 
    Collection::offsetUnset() removed | 
| 
                                 1 
             | 
    ↛ | 
                     | 
    Collection::offsetExists() removed |