Serializer's to_representation does not check a proper manager base class

[Kamil Kamil]

I am wondering why in the serializer's to_representation method, in this line:

iterable = data.all() if isinstance(data, models.Manager) else data

Manager base class is checked, but not BaseManager?

I am asking because I have something like this:

class MyQuerySet(QuerySet):

   ....

class MyManager(BaseManager.from_queryset(MyQuerySet):

   ...

but then I can't serialize the list of elements because MyManager is not an instance of Manager. I could do MyManager(Manager.from_queryset(MyQuerySet) but is it a good idea? - I rather think this should be changed in django code