I hope no-one minds me asking one of those daft questions that (probably} serves no practical purpose but, as on the TV programme QI, I would be quite interested to know the answer.
When the camera is in a mode in which the exposure is set automatically, does it set the actual values shown on the LCD screen (e.g. 1/125, f16, etc), or is it really more precise (e.g. 1/129, f15.7, etc.) and simply displaying the nearest well-known increments?