For the record: the original BUG #2535 report should be viewed in UTF-8 to see inserted values.
--
Marius Zalinauskas
> The following bug has been logged online:
>
> Bug reference: 2535
> Logged by: Marius Žalinauskas
> Email address: mariusz@splius.lt
> PostgreSQL version: 8.1.4
> Operating system: Windows XP Pro
> Description: Unicode on Windows: aogonek is not
> distinguished from
> agrave
> Details:
>
> It seems that on Windows PostgreSQL v8.1.4 does not
> distinguish aogonek
> (U+0104, U+0105) from agrave (U+00C0, U+00E0):
>
> CREATE DATABASE tests ENCODING = 'UTF8';
>
> \c tests
>
> CREATE TABLE foo
> (
> bar char(1) PRIMARY KEY
> );
>
> -- OK
> INSERT INTO foo (bar) VALUES ('ą');
>
> -- ERROR: duplicate key violates unique constraint
> INSERT INTO foo (bar) VALUES ('à');
>
> -- Same thing with capitals
>
> -- OK
> INSERT INTO foo (bar) VALUES ('Ą');
>
> -- ERROR: duplicate key violates unique constraint
> INSERT INTO foo (bar) VALUES ('À');