I know I'm half a month late in noting this, but Gruber confesses to why such a quick update to the 1.2.1 release of SmartyPants was necessary:

See, back in 1998 I became the owner of a South American woolly monkey, whom I named Paco, with the intention of training him to assist in my freelance graphic design work. Everyone told me this was a terrible idea, that it would not work, that at the very least I would need a chimpanzee or orangutan, that a mere monkey would never be able to do graphic design. I was unswayed. Do you know how much food chimpanzees and orangutans eat? And for chrissakes, an orangutan can beat you up--I've seen those Clint Eastwood movies, those [BLEEP]ers can pack a punch. I do not need to be coldcocked by my lower-primate assistant. What I wanted was a monkey, a loyal friend who, when otherwise unoccupied, could sit on my shoulder and pick crumbs out of my hair.