Possibly a bug

Hello. If the *user* parameter is passed to a function, the other
parameter is not converted to uppercase (if it is cirillic). The same
with procedures and if you swap the params.

/create or replace function to_upper_first(param1 text, param2 text)
returns text as
$$
    select upper(param1) || ' ' || upper(param2) || ' ' || param2;
$$ language sql;

select version();
select  to_upper_first('тест', *user*::text);/

Output:

134 ms

CREATE FUNCTION
version
--------------------------------------------------------------------------------------------------------------------
PostgreSQL 18.1 (Debian 18.1-1.pgdg13+2) on x86_64-pc-linux-gnu, compiled by gcc (Debian 14.2.0-19) 14.2.0, 64-bit
(1 row)

to_upper_first
--------------------------------------------------------
тест USER_44D38K4ZB_44D4GQVSV user_44d38k4zb_44d4gqvsv
(1 row)

/https://onecompiler.com/postgresql/44d4fxa3x/

/---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------/

select to_upper_first('test', user::text);

to_upper_first
--------------------------------------------------------
TEST USER_44D38K6QJ_44D4GTCEM user_44d38k6qj_44d4gtcem
(1 row)