It looks like mint (specifically useragent007) is incorrectly identifying OS X 10.10 as 10.1. When I look at my stats, I’m starting to see a bunch of hits from OS X Puma. These didn’t show up until Yosemite was released.
I’m sure it has something to do with this regex, but I’m not a real expert at that:
if (preg_match(‘#Mac OS X (10[^;]+)#i’, $user_agent, $m))