CaseInsensitiveModelBackend error in caseinsensitiveauth.py

[rscottco]

Hello again,

Line 7 of calloway/apps/django_ext/caseinsensitiveauth.py reads:

CHARS = getattr(settings, 'ALLOWED_USERNAME_CHARS', \''.join(_alphanum.keys()) + '-_')

're._alphanum' is a frozenset, not a dictionary/map, thus should drop the '.keys()" and read:

CHARS = getattr(settings, 'ALLOWED_USERNAME_CHARS', ''.join(_alphanum) + '-_')

Such a minor issue to fix it is so not worth forking.

Kind regards,

Scott SA