Do "first up-vote" and "first down-vote" mean that literally? update: yes.
Or do they mean transitioning from rep 0 to 1 or -1, whether or not there have been previous up/down votes? Or do they mean "first time entering a reputation range > 0 or < 0"?
Update: thanks for clarifying, tye. I was indeed reluctant to assume more than reputation was stored, since I saw nothing else needed under the current system.
I'm glad to see such minimal changes; the system seems to produce good results, and it's far better to change too little than too much.