Hello, It seems that when using a '+' character in the branch name, such as in the wip-ipython+polyglossia branch I pushed to Savannah, Cuirass is not able to use it as part of a job specification, at least one made via the web interface as found here: https://ci.guix.gnu.org/jobset/wip-ipython%2Bpolyglossia.
Thanks, Maxim
