Yes, I'm referring to the same. Tim Graham also answered this in django-core-mentorship [https://groups.google.com/forum/m/#!topic/django-core-mentorship/qNtv-NqgDkc]
Currently I'm thinking over the possible use cases where this can be useful other than the need to define the mixin on our own. If you see a problematic situation, I'd like to hear about it. One such is talked in this https://code.djangoproject.com/ticket/21936 (providing success message for deletion) -- You received this message because you are subscribed to the Google Groups "Django developers (Contributions to Django itself)" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-developers+unsubscr...@googlegroups.com. To post to this group, send email to django-developers@googlegroups.com. Visit this group at https://groups.google.com/group/django-developers. To view this discussion on the web visit https://groups.google.com/d/msgid/django-developers/8f76c2e7-8987-490d-8a05-4ab6bc18397d%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
