WHERE virtual column index substitution causes wrong results when truncation happens

CREATE TABLE t (a INT, va TINYINT AS (a), key (va));

INSERT IGNORE INTO t (a) VALUES (100),(150),(200),(180);

Warnings:

Warning	1264	Out of range value for column 'va' at row 2

Warning	1264	Out of range value for column 'va' at row 3

Warning	1264	Out of range value for column 'va' at row 4

explain

select * from t where a = 127;

id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

1	SIMPLE	t	ref	va	va	2	const	3	

select * from t where a = 127;

a	va

150	127

200	127

180	127

select * from t use index() where a = 127;

a       va

drop table t;