Comment by bkirwi

Of course, there really is something special about 0, 1, and Inf -- they're the kind of numbers that tend to arise from theory, not just from tuning. Tuning is hugely important for real systems, so an allergy to 'arbitrary' numbers is not useful; on the other hand, this rule is often a nice heuristic to keep in mind when you're picking which numbers to expose in your config files.