This is why normalization methods exist, but is also the source of various security flaws, like Spotify's issue in June 2013 [1] with user names that were diffe

This is why normalization methods exist, but is also the source of various security flaws, like Spotify's issue in June 2013 [1] with user names that were different at the Unicode level, but normalized into forms that were not unique. (Their example, the account 'ᴮᴵᴳᴮᴵᴿᴰ' could seize control of the account 'bigbird'.) [1] http://labs.spotify.com/2013/06/18/creative-usernames/ http://labs.spotify.com/2013/06/18/creative-usernames/