[Dovecot] Case-insensitive "detail" mailboxes?

[/dev/rob0]

We're using sieve with LMTP. We want to have lda_mailbox_autocreate 
and lmtp_save_to_detail_mailbox. Is there a way to make the "detail" 
case-insensitive? If so I have not found it yet.

I suppose we could lowercase the input string for the SQL userdb 
query, but that's not what is wanted. The idea being that if a user 
makes a mailbox called "Test" is that user+test at example.com and 
user+TEST at example.com should both go to that "Test" mailbox. If it 
was lowercased, a mailbox called "Test" would be ignored and "test" 
used.

With autocreate, this could be a problem if mail is delivered to 
autocreated case-sensitive mailboxes that the user won't see.

Hmmm, maybe a global sieve script?
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