carljm/django-model-utils — pull request #133 by schinckel (2014-05-16 10:55:30+00:00)
Title: Add ability to filter an InheritanceQuerySet by model.

This is based upon the feature in django-polymorphic, where you
can do:

SuperClass.objects.instance_of(SubClass)

This will result in only objects of the subclass being fetched.

Note: this works with any queryset, keeping the filtering and
ordering applied there.

Is this something that would be considered? I'll write up some tests if that is the case.