See https://answers.launchpad.net/launchpad/+ticket/2796 and https://answers.launchpad.net/launchpad/+ticket/3406 for a use case.
See https:/ /answers. launchpad. net/launchpad/ +ticket/ 2796 and https:/ /answers. launchpad. net/launchpad/ +ticket/ 3406 for a use case.