> That's a reasonable option for what "Catalina" might mean from context clues.
Agreed! But my comment was in reply to someone who wants you to believe that he genuinely read "99.999%" as a claim about the size of the Mac user base. His game is not one of context clues, and you don't need to play it.
yeah the numbers were weird but thought there's plenty of crazy usernames out there. Didn't pay a lot of attention though, went through the comments and saw it was about Mac and I could safely ignore it.
On a website whose primary audience is technology professionals, it's reasonable to assume that a significant portion of the audience can recognise the version name of a computer operating system that is at least the second most-popular in the world, and possibly the most popular among this site's audience.
But it's also part of HN's ethos that not everything has to be spelled out all the time, and that it's OK if users sometimes have to "work a little":