Incorrect casting of BIT columns by pt-archiver

CREATE TABLE `test`.`gerald` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`val` bit(1) NOT NULL DEFAULT b'0',
PRIMARY KEY (`id`,`val`)
) ENGINE=InnoDB AUTO_INCREMENT=122 DEFAULT CHARSET=utf8mb4;
CREATE TABLE test.gerald_tmp LIKE gerald;
INSERT INTO test.gerald (val) VALUES (0),(1);
INSERT INTO test.gerald (val) SELECT val FROM test.gerald ;
INSERT INTO test.gerald (val) SELECT val FROM test.gerald ;
INSERT INTO test.gerald_tmp SELECT NULL, val FROM test.gerald;
$ ./pt-archiver --source A=utf8mb3,h=127.0.0.1,P=35387,p=msandbox,u=msandbox,D=test,t=gerald --purge --where '(val) in (select a.val from test.gerald_tmp a where id =2)' --progress 10 --limit 1 --no-check-charset --no-ascend
# A software update is available:
TIME                ELAPSED   COUNT
2022-10-18T16:26:46       0       0
DBD::mysql::st execute failed: Truncated incorrect DOUBLE value: '' [for Statement "DELETE FROM `test`.`gerald` WHERE (`id` = ? AND `val` = ?)" with ParamValues: 0=122, 1='.'] at ./pt-archiver line 6795.