Make Model Castable Porperties inheritable

[misakstvanu]

There is something I would consider an issue. It is not possible to have a super-class Model with Lift trait and more classes that inherit it. CastValues's static property $modelCastableProperties would be in that case built only once - with data of the first calling class. Like so:

class Super extends Model {
    use Lift;
}
class A extends Super {
    protected $casts = ['data' => 'integer']
}
class B extends Super {
}

$entityA = A:create(['data' => 123]); // Casts are built, merged and saved.
$entityB = B:create(['data' => 123]); // There is no rebuild for class B, casts created in previous class A are merged. Result is  ['data' => 'integer'].

There is probably a cleaner solution, but I propose saving the casts per static::class.

[WendellAdriel]

Since I never extend a model I forget that this is possible hahahahaha
Good catch here, thanks!