Mail box creation bug(?) in cyrus imap 2.1.11

[Cove Schneider]

Hi,

If you try to create mail box under the INBOX called "INBOX", Cyrus 
fails the creation; though if you try and create a mail box called 
"INBOX.Test", Cyrus creates the "INBOX" and "Test" folder underneath it.

spool/imap/c/user/cove# find INBOX -ls
2425031    4 drwx------   3 cyrus    mail         4096 Jun 19 13:36 
INBOX
2425032    4 drwx------   2 cyrus    mail         4096 Jun 19 13:36 
INBOX/Test
2425036    4 -rw-------   1 cyrus    mail          150 Jun 19 13:36 
INBOX/Test/cyrus.header
2425034    4 -rw-------   1 cyrus    mail           76 Jun 19 13:36 
INBOX/Test/cyrus.index
2425035    4 -rw-------   1 cyrus    mail            4 Jun 19 13:36 
INBOX/Test/cyrus.cache

This confuses Apple Mail.app quite a bit, causing it to not display the 
contents of the Inbox and I've sent them a bug note. I think what 
happened to me was that I created a folder with Mozilla (older 
version?) and it created it just like I described above -- not 
realizing that the prefix was already INBOX(?). Who knows...

Version info
OS: RedHat 7.2
Server: cyrus-imapd-2.1.11-1
(From Simon MATTER's most excellent RPM collection)

Cove