wp core update command reports success, yet core update doesn't happen. This is supposed to work, right?
$ wp core version --extra
WordPress version: 3.1.3
Database revision: 17516
TinyMCE version: 3393a
Manifest revision: 20111113
$ wp core update
Updating the WordPress core.
Success: WordPress is at the latest version.
$ wp --version
wp-cli 0.4.0-dev
wp core update command reports success, yet core update doesn't happen. This is supposed to work, right?