FUNCTION declaration fails with ERROR 1064 (error in SQL) when using oracle sql_mode and OUT parameter

10.8.0>SET sql_mode='';  # Optional, here to show the clear difference oracle mode makes

Query OK, 0 rows affected (0.000 sec)

10.8.0>DELIMITER #

10.8.0>CREATE FUNCTION f(OUT c INT) RETURNS INT BEGIN SET c=1; RETURN c; END; #

Query OK, 0 rows affected (0.010 sec)

10.8.0>DELIMITER ;

10.8.0>SET sql_mode='oracle';

Query OK, 0 rows affected (0.000 sec)

10.8.0>DELIMITER #

10.8.0>CREATE FUNCTION f(OUT c INT) RETURNS INT BEGIN SET c=1; RETURN c; END; #

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'OUT c INT) RETURNS INT BEGIN SET c=1; RETURN c; END' at line 1

10.8.0>DELIMITER ;