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A recurring topic that Eben Sorkin has been bringing up is the variation of letters within body text faces, something that today doesn't seem to happen as much.
While I was working to put in the ligatureless ligatures, I also started playing around with some other variants. In my Coruña, the f and j have extremely long descenders that can occasionally collide or can make a space look like it's not really a space. Kerning almost always looks wrong, so in these cases, the letters automatically close up into a more compact form.
What are some other subtle substitutions y'all've seen either in older fonts or modern digital ones?