JulianBirch/leiningen — comment on commit 7f58cbcee5b6c64b5a4eb1cbf574cf5a2f457f9e
File: leiningen-core/src/leiningen/core/project.clj line 93
By JulianBirch:

You can mark something in project.clj as displace to indicate you want it wiping if there's an alternative value.