Character set issues give me headaches.
So I just ran a test at the command-line, moving 500 testnet bitcoins to an account named "฿"
The account created is named "\u00E0\u00B8\u00BF", which is not what I intended. E0 B8 BF is the utf-8 representation of the unicode Thai Baht character.
Thinking this through, trying hard not to get a headache...
My terminal window has: LC_CTYPE=en_US.UTF-8
So when I copy&paste the Thai baht symbol, it is being encoded as UTF-8.
I pass a UTF-8 string to bitcoind, and it uses the JSON-Spirit library to convert it into a JSON string (which is defined to be Unicode... encoded using backslashes, I think: see http://www.ietf.org/rfc/rfc4627.txt ). And there's the bug. Maybe. I think?
Command-line bitcoind should be looking at the locale and converting JSON strings to/from that locale. Anybody motivated enough about internationalized account names (and send comments) to teach it to do that?