Comment # 2 on bug 1131072 from Matt O

(In reply to Marguerite Su from comment #1)
> please provide your fonts.conf

Currently (to get slashed zeroes):

~/.config/fontconfig/fonts.conf

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
    <match target='font'>
        <test name='fontformat' compare='not_eq'>
            <string/>
        </test>
        <test name='family'>
            <string>IBM Plex Mono</string>
        </test>
        <edit name='fontfeatures' mode='assign_replace'>
            <string>ss03</string>
        </edit>
    </match>
</fontconfig>