[benj111]

So how do you uppercase or lowercase an arbitrary character?

How do you check if it's a valid character?

How do you deal with combining characters?

Most of the world don't use just the Latin subset in ASCII or follow the same assumptions about letters, words, cases etc etc.

[avadodin]

That's the trick.

You don't.

[benj111]

So you solution to dealing with X is 'dont deal with x'?