From:
http://docs.djangoproject.com/en/dev/topics/http/urls/#topics-http-urls
Each captured argument is sent to the view as a plain Python string,
regardless of what sort of match the regular expression makes.
* * *
Does anybody think it would be nice to specify coercions like you can
on TypedChoiceField.
Speaking of which, wouldn't it be nice if MultipleChoiceField behaved
similarly?