Possibly fix an infinite recursion crash by avoid str() inside repr() (#1507)
Possibly fix an infinite recursion crash by avoid str() inside repr() (#1507)

See https://code.djangoproject.com/ticket/33134
django-debug-toolbar/django-debug-toolbar,django-debug-toolbar/django-debug-toolbar,spookylukey/django-debug-toolbar,spookylukey/django-debug-toolbar,tim-schilling/django-debug-toolbar,tim-schilling/django-debug-toolbar,jazzband/django-debug-toolbar,tim-schilling/django-debug-toolbar,jazzband/django-debug-toolbar,jazzband/django-debug-toolbar,django-debug-toolbar/django-debug-toolbar,spookylukey/django-debug-toolbar