Incompatible behavior with MySQL when cast negative number to unsigned

-- mariadb

DROP TABLE t1;

CREATE TABLE t1 (c1 DECIMAL(10,0));

INSERT INTO t1 VALUES (-1);

SELECT CAST(c1 AS UNSIGNED) FROM t1; -- {0}

-- mysql

DROP TABLE t1;

CREATE TABLE t1 (c1 DECIMAL(10,0));

INSERT INTO t1 VALUES (-1);

SELECT CAST(c1 AS UNSIGNED) FROM t1; -- {18446744073709551615}