True. The historical reason is that it was (well still is) originally a general biased coin flipper where you could enter any expression that evaluated to a pro

True. The historical reason is that it was (well still is) originally a general biased coin flipper where you could enter any expression that evaluated to a probability. Then we added syntactic sugar for the case of restaurant bill splitting. UI improvements welcome! Bethany has it on github: https://github.com/bsoule/Expectorant https://github.com/bsoule/Expectorant