Case insensitivity is a nice way of phrasing "there are these arbitrary mappings between two sets of character codes which are meaningful only to the human bein

Case insensitivity is a nice way of phrasing "there are these arbitrary mappings between two sets of character codes which are meaningful only to the human being looking at the screen." This only works for ASCII and is complete madness as soon as you consider that any symbol you support for input anywhere in the world can and probably will be used by someone to name their files (try explaining why they can't to an irate user). Really, of the hundreds of thousands of unique symbols that human beings use an arbitrary subset of 26 of them have been deemed to be identical when it comes to naming things with symbols. I would say more but it would come out even worse.