In that case, there are inconsistencies in various other definitions. But, given the lack of interest and the fact that the "bug" doesn't cause any problems, I'm going to let it go.
I've working with René Bohne's1 ATtiny2313 core and R. Wiersma's1 ATtiny84 core. So I need to know what "NOT_A_PIN" is (along with a few other oddities).
1 THANK YOU!
And thank you bill2009 for publishing your work ATtiny change.