Fun, tangential anecdote: I worked with a CSV containing, among other things, phone numbers. A coworker called and complained that the phone numbers were all w

Fun, tangential anecdote: I worked with a CSV containing, among other things, phone numbers. A coworker called and complained that the phone numbers were all wrong. He'd edited the thing in MS Excel, which promptly converted the phone numbers to floating point with a loss in precision. When he saved it, those new numbers were happily written back to the disk.