there is this: https://github.com/edx/edx-platform/blob/master/lms/djangoapps/django_comment_client/permissions.py#L97-L98 . its definition looks a little funny to me.

but it is not addressed here https://github.com/edx/edx-platform/blob/master/lms/djangoapps/django_comment_client/utils.py#L253 where things are turned into can_*