Deprecated interfaces in Entity and ClosureTable

[AnzePratnemerDSpot]

Why werent they removed from code if they are deprecated in >6.0.

6.1.1. still has class Entity extends Eloquent implements EntityInterface with EntityInterface marked as deprecated..
Problem is later in the code (Entity.php@1771) with $parent->getKey() method being undefined.

Also Entity.php@1904 transaction($callable) method expects parameter type Closure instead of given type callable.