As a reminder, we’re also interested in feedback about any functionality that normally works but is broken on the test wiki, even if you don’t fool around with exotic Unicode characters. Some breakage may be due to other experiments we’re running there, but some of it could be due to the character encoding version. We need to know just in case. We took the entire database contents and converted it to a new character encoding, which under ordinary circumstances would be pretty scary, let alone in a large MediaWiki installation.