ldap attribute modifiers. how to lowercase non ASCII

hi all,

I encountered some problem with lowercasing chars like an "Ä"

with user_attrs like this:

user_attrs = uid=home=/mail/%Lu, =myvar=%L{ldap:uid}

the Ä doesnt get lower cased in both cases

# doveadm user BLÄTULA field value user blÄtula uid vmail gid vmail home /mail/blÄtula mail maildir:~/Maildir:LAYOUT=fs:INBOX=~/Maildir/INBOX myvar blÄtula

somebody knows if there a fix for that?

Greetz Matze