Regarding bug 18152 MARC::Record->encoding should not be called directly from our codebase. C4::Charset::SetMarcUnicodeFlag should call MARC::Record->encoding for MARC21 and NORMARC but does the UNIMARC trick for UNIMARC records. It seems that MARC::Record->encoding calls should be replaced with C4::Charset::SetMarcUnicodeFlag everywhere.