Is it possible to remove a glyph via a substitution rule using Glyphs? The afdko documentation mentions
sub A by NULL;, however this results in the error ‘Unexpected “NULL” in rule substitution’ when I try it in Glyphs (3086).
I understand this is a relatively new addition to the afdko spec — is there a plan to implement it in Glyphs? (Or is it already present under a different syntax?)