Hi divoplade, It is marked as a TODO exactly because it causes a world rebuild. guile-3.0 will presumably be updated on the next core-updates merge, where world rebuilds are acceptable, so be a bit patient until then and use guile-3.0-latest, please :) (Note, that you should also get guile-3.0-latest from specification- >package if that is a concern.)
Regards, Leo
