isinstance(QPointer<T> instance, T) should return True from Python

Let's consider the two following functions:

QPointer<ABstractType> function_a();  // returns a QPointer<ConcreteType>
ABstractType* function_b();                   // returns a ConcreteType*

From Python, both will return something that behave the same except for isinstance(object, ConcreteType), with QPointer it will return False.

Digging a bit shows that QPointer wrapped type mro is:

ABstractTypePtr.mro() -> [module.ABstractTypePtr, Shiboken.Object, object]

While the ConcreteType* has something like:

ConcreteType.mro() -> [module.ConcreteType, module.ABstractType, Shiboken.Object, object]

Shouldn't ABstractTypePtr behave exactly like without QPointer?