Non-Latin characters problem (id's and stuff)

[Zegnåt]

I tried to create a page with named “asd” and when I created another one with the same page title, the new page was overwritten over (written over?) the old one .

That’s odd, here I am remembering seeing numerals appended to my slugs.

the remove_accent function in WordPress' wp-includes/formatting.php. Would it be considered cheating if we peeked that file?

Peeking no, copying will make it a bit odd though due to licensing. As I believe the WordPress license does not allow relicensing we would be forced to slap their license on our complete core if we were to “borrow” their functions. On the other hand, writing our own functions that work exactly the same would be allowed. (Licensing publicly available code on the web is a bit weird.)