Too much escaping in optimizer trace

--source include/have_sequence.inc

create table t1 (a varchar(10), key(a));

insert into t1 select concat('x', seq) from seq_1_to_100;

insert into t1 values ('a"1'), ('a"2'), ('a"3');

set optimizer_trace='enabled=on';

--sorted_result

select a from t1 where a in ('a"1', 'a"2', 'a"3');

select json_detailed(json_extract(trace, '$**.range_scan_alternatives[*].ranges'))

  as ranges

from information_schema.optimizer_trace;

drop table t1;

select json_detailed(json_extract(trace, '$**.range_scan_alternatives[*].ranges'))

as ranges

from information_schema.optimizer_trace;

ranges

[

    [

        "(a\\\"1) <= (a) <= (a\\\"1)",

        "(a\"2) <= (a) <= (a\"2)",

        "(a\"3) <= (a) <= (a\"3)"

    ]

]