Keep alternates next to base glyphs

Keep alternates next to base glyphs don’t work for numerals and other glyphs. Only the A-Z, a-z.

Would be fab if they worked for numbers and everything else too.

Thanks!
Göran

Also on ligatures, so it will make sense like this:

o_o o_o.ss01


Fixed this.

It is a bit more complicated with the numbers as they have suffixes with a different meaning. I will need to look into it later.

Thanks!