Valac is still using deprecated annotation "allow-none"
"allow-none" appears to have been deprecated 6 years ago in favor of new annotations: https://bugzilla.gnome.org/show_bug.cgi?id=660879 .
"allow-none" appears to have been deprecated 6 years ago in favor of new annotations: https://bugzilla.gnome.org/show_bug.cgi?id=660879 .