illuminate/foundation — pull request #36 by franzliedke (2012-11-06 23:20:57+00:00)
Title: Allow strings as filter callbacks, too.

This seems to make sense, as this [is allowed in the router](https://github.com/illuminate/routing/blob/cf544a27cb0c57be8c69c8466181d5b19e5f040d/src/Illuminate/Routing/Router.php#L627), too, where these calls are just passed through to.

Feels more consistent, I'd say.