Description:
------------
A class that implements an interface should implement interface's methods, but a method inside that class with type hint of class that implements the interface would be accepted. Or not!?

After all, both are hierarchically identical.

Test script:
---------------
interface IEntity
{
    public function equals(IEntity $other);
}

class Entity implements IEntity
{
    public function equals(Entity $other)
    {
        return $this === $other;
    }
}

Actual result:
--------------
Fatal error: Declaration of Entity::equals() must be compatible with that of IEntity::equals() in C:\wamp\www\horusweb\models\Coded.class.php