[Zope] Force ZCatalog to UTF-8

[Garito]

Hi all!

How can I force ZCatalog to use only unicode strings (UTF-8)?

I'm trying to change all zope to use these charset. For that I install 
Zope 2.9.1 and I change on zope.conf:

rest-input-encoding utf-8
rest-output-encoding utf-8
default-zpublisher-encoding utf-8

but ZCatalog don't catalog unicode if the string is not an unicode 
string (at least I think so)

Any idea?

Thanks a lot!

-- 
Mis Cosas
http://blogs.sistes.net/Garito/