It doesn't even have to be an "edge case", as stated in the article. My first name has a single accented vowel and breaks tons of online forms. What annoys me is not so much having to re-enter my name with the unaccented version of the vowel, it's when the form throws up an error message saying "Enter a Valid Name" [or suchlike]. I find that insulting. At least make your error text put the blame where it belongs: "So…
The package was delivered to Australia, as my local post office showed me on a printout, and lost forever.
The best I can figure out it, it was because I dared to use the accented 'ç' character in the country's name, and their computers were not able to handle this.