Implicit or explicit CAST from MAX(string) to INT,DOUBLE,DECIMAL does not produce warnings

SELECT 'x' << 1, CAST('x' AS DOUBLE), CAST('x' AS DECIMAL);

SHOW WARNINGS;

+---------+------+----------------------------------------+

| Level   | Code | Message                                |

+---------+------+----------------------------------------+

| Warning | 1292 | Truncated incorrect INTEGER value: 'x' |

| Warning | 1292 | Truncated incorrect DOUBLE value: 'x'  |

| Warning | 1292 | Truncated incorrect DECIMAL value: 'x' |

+---------+------+----------------------------------------+

SELECT MAX('x') << 1, CAST(MAX('x') AS DOUBLE), CAST(MAX('x') AS DECIMAL);