I love oldstyle numerals and have started using them in my design work. What I'm wondering is: If I have a heading or subheading or something that includes numbers, should I switch to lining figures for those? I've heard lining figures are sort of the equivalent of capital letters (while the oldstyle ones are the equivalent of lower-case). But I'm not sure I should mix them. What's the usual practice for that?
Thanks, Phyllis