Wondering what the upper limits are. I'm guessing 32 bit signed integers for speed, but I suspect someone knows off the top of their head.
Without some testing, though, we wouldn't be able to determine if the code for the site handles overflows gracefully, which would turn a 2 billion rep (and change) into a negative 2 billion rep (again, assuming 32 bit signed integer). If this assumption is correct, then we only have another 22,000 years or so before Jon Skeet overflows, so a swift answer and action is important.
- What is the storage format/space/type for rep and votes for a question/answer?