https://bugzilla.redhat.com/show_bug.cgi?id=2149834
--- Comment #27 from Benson Muite benson_muite@emailplus.org --- The documentation https://valadoc.org/gio-2.0/GLib.SimpleAction.SimpleAction.stateful.html#! indicates the last entry is the initial state, so this should match what is in the schema.
Schema example at https://wiki.gnome.org/Projects/Vala/GSettingsSample seems much clearer.