Cache_fu bug?

myobj = Myobj.cached(:find_by_user_id, :with=>user_id)

Debug gives:
==> Got Myobj:find_by_user_id:1

BUT on expire_cache:

==>Deleted Myobj:1:find_by_user_id

The key is totally screwed up.

I’m digging into the plugin code right now - but does anyone know if
this is a bug or am I doing something wrong?

thanks.