I can confirm this, but there are a few stipulations for this to actually occur. First, the IRC server has to support more than 11 characters in the ident, the second being your identd (be it mIRC or something similar) has to support sending 11 characters.
Testing an 11 ident length using mIRC is kind of difficult when it won't send 11 characters, but using oidentd or simply telnetting to a server with support for >10 characters works.
$address/$address() confirmed on mIRC 6.31 on Windows XP 64Bit SP2 with no external scripts.