fullname should not be the same for all styles of variable fonts
Right now, fc-scan on https://github.com/IBM/plex/blob/master/IBM-Plex-Sans-Variable/fonts/complete/ttf/IBMPlexSansVar-Roman.ttf
Returns a lot of different styles and families, but a single fullname
I'm quite sure this is going to break apps right and left, fullname should point to a single (family,style) tuple
fontconfig-2.13.92-3.fc32.x86_64