dovecot - May 2022 - Fix lmtp_save_to_detail_mailbox to be case insensitive?

To bring this up again because i have not found a work around solution.
Can dovecot make lmtp_save_to_detail_mailbox case-insensitive?

If you create a folder "foobar" then an email with recipient
user+foobar at example.com will be placed in the folder.

However with the folder as "foobar" an email with recipient
user+FOOBAR at example.com will report folder "FOOBAR" not found and
the email will be placed in the inbox folder.

On 2022-05-21 19:17, dovecot at ptld.com wrote:
> To bring this up again because i have not found a work around solution.
> Can dovecot make lmtp_save_to_detail_mailbox case-insensitive?
> 
> If you create a folder "foobar" then an email with recipient
> user+foobar at example.com will be placed in the folder.
> 
> However with the folder as "foobar" an email with recipient
> user+FOOBAR at example.com will report folder "FOOBAR" not found
and the
> email will be placed in the inbox folder.
i belive if you post doveconf -n you will get more help :)

and as i sayed on postfix-millist, change %u to %Lu will solve it, if 
that does not solve it, we have a dokumented bug then

# /etc/dovecot/conf.d/10-auth.conf
auth_username_format = %Lu