331f08fc40
Defining valid values makes 1. changing settings less error prone 2. sure they are discoverable. This does reset the values once on update, but fortunately does *not* change the way to set the values. Thus e.g. enabling fractional scaling via terminal command still works as before and internet guides stay valid. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1961>