Is this a bug or do I just not understand it?

I have a view of users. There is a date field in user's profile. I want to add a context filter (D7, argument as was in D6) to define a range for these fields. For example, say it was user's birthday and I want a view user/birthday/2011-1-1/2011-2-1 that is to return all users whose birthday is 1 Jan 2011 to 1 Feb 2011. All I can get the context filter to take is a single argument. The query ends up as

.....(DATE_FORMAT(field_birthday.field_birthday_value, '%Y-%m-%d') >= '2011-11-01' AND DATE_FORMAT(field_birthday.field_birthday_value, '%Y-%m-%d') <= '2011-11-01') )

I can't get a second argument into the field. Is this still a bug as http://drupal.org/node/368395 suggests? Apha5 post dates that.