With or without Unicode's own meddling, characters may still look the same. Think of non-Latin alphabets that have letters defined in an identical fashion to th

With or without Unicode's own meddling, characters may still look the same. Think of non-Latin alphabets that have letters defined in an identical fashion to those in Latin alphabet. Heck, even without other alphabets, the Latin letter O and the digit 0 are valid characters for filenames in any system I know of, and although looking the same they are yet different. (Having a bar, a point, or some other distinctive mark inside 0 is just a hack, the common description for the aspect of this digit makes no distinction from letter O.) This problem is not new, definitely not brought up by this Unicode thing.