[boost] changes to serialization (split_free)?

I just updated to latest cvs head, and my serialization split_free broke. It used to be that namespace boost { namespace serialization { template<class Archive, class U> inline void serialize (Archive &ar, ublas::vector<U>& v, const unsigned int file_version) { boost::serialization::split_free (ar, v, file_version); } } } Would work when 'save' and 'load' were free functions in ::namespace, but now I'm getting 'no matching function' for 'save' and 'load'. Moving 'save' and 'load' into boost::serialization namespace fixed it. Is this expected/desired? This is gcc-4.1.1 (fedora fc6)