By 'lowercase numbers', do you mean https://en.wikipedia.org/wiki/Text_figures https://en.wikipedia.org/wiki/Text_figures? I've never heard the term before, and

By 'lowercase numbers', do you mean https://en.wikipedia.org/wiki/Text_figures https://en.wikipedia.org/wiki/Text_figures? I've never heard the term before, and initially wondered if it was some sort of joke, but it would seem not. Interesting stuff, typography.