Interesting — until I read your comment, I would have assumed the opposite. So the preferred method to reference pin numbers is by their naked (unsigned integer) value?
P.S. Actually, would it be possible to split this comment (#9) into a separate topic, and respond to it there? (as I also have follow-up questions about conventions for using some other other all-caps identifiers, such as HIGH/LOW, which will be off-topic in the current thread.)