Wrong uppler lower for national characters.

Hi.
Next code:

select upper(field1) from table1;

Convert all latin symbols <128 in to UPPER case but all not latin >128
in lower case locale consistent.  Function lower work vicevesa upper(),
wrong too.

ilake() function work wrong too.

Environment:
ASPLinux 7.2.
gcc 2.96
kernel 2.4.9-13.smp
PostgreSQL 7.4beta3