I'm noting for posterity of this thread that I've opened a ticket and issued a
pull-request.
Ticket: https://code.djangoproject.com/ticket/24639
PR: https://github.com/django/django/pull/4497
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"Django developers
Hi,
I mentioned on the Django User Mailing List that the interaction of
ValidationError, mark_safe, and ugettext was not what I expected.
https://groups.google.com/d/topic/django-users/Soik095MTaI/discussion
Succinctly, the two versions of clean_slug below behave differently, when they