Character conversion between authentication and authorisation

["Markus Moeller" <huaraz@xxxxxxxxxxxxxxxx>]

How are special characters converted in squid ? For example my 
squid_kerb_auth would return müller  for müller, but when using %LOGIN for 
the authorisation helper I get  m%C3%BCller which I don't expect in 
squid_kerb_ldap.

Are there fucntions in squid which convert strings into different chracter 
sets?

Markus