Variable declarations accept unexpected data type attributes (lengh,dec,srid)

SET sql_mode=ORACLE;

DELIMITER $$

CREATE OR REPLACE PROCEDURE p1 AS

  TYPE rec0_t IS RECORD (a INT);

  r00 rec0_t (10);

  r01 rec0_t (10,2);

  r2 rec0_t REF_SYSTEM_ID=101;

BEGIN

  NULL;

END;

$$

DELIMITER ;

SET sql_mode=ORACLE;

DELIMITER $$

CREATE OR REPLACE PROCEDURE p1 AS

  TYPE assoc0_t IS TABLE OF INT INDEX BY INT;

  r00 assoc0_t (10);

  r01 assoc0_t (10,2);

  r2 assoc0_t REF_SYSTEM_ID=101;

BEGIN

  NULL;

END;

$$

DELIMITER ;

SET sql_mode=ORACLE;

DELIMITER $$

CREATE OR REPLACE PROCEDURE p1 AS

  r00 SYS_REFCURSOR (10);

  r01 SYS_REFCURSOR (10,2);

  r2 SYS_REFCURSOR REF_SYSTEM_ID=101;

BEGIN

  NULL;

END;

$$

DELIMITER ;