Indeed, a fundamental to the problem is that most unicode text doesn't actually carry the relevant locale information... (Of course, one probably wouldn't want

Indeed, a fundamental to the problem is that most unicode text doesn't actually carry the relevant locale information... (Of course, one probably wouldn't want to rely on sender-specified locales for email adresses when deciding address equality -- that would open one up to all sorts of potential weird scenarios, i.e. a nightmare for security).