Pass through original entity + PHPStan Cleanup

[dereuromark]

With this the following works without having to fork/copy the behavior on project level:

            'set' => [
                'ancestor_id' => function (Order $order, Order $original) {
                    return $original->id;
                },
            ],

[ADmad]

I don't see any change except for the phpstan cleanups. Please at least make a separate commit for the change you are proposing to make reviewing easier.

[dereuromark]

Indeed, those are only PHPStan so far.

[dereuromark]

I forget the other changes and would add them on top or as separate PR.

[ADmad]

Changing seems find except for the argument order I commented about. Also please add some tests.