I don't know how do_execsql_test works. Is the {4} at the end the number of row returned? From Richard's update to the test suite:
```
# 2020-03-19
# The ESCAPE clause on LIKE takes precedence over wildcards
#
do_execsql_test idu-6.0 {
DROP TABLE IF EXISTS t1;
CREATE TABLE t1(id INTEGER PRIMARY KEY, x TEXT);
INSERT INTO t1 VALUES
(1,'abcde'),
(2,'abc_'),
(3,'abc__'),
(4,'abc%'),
(5,'abc%%');
SELECT id FROM t1 WHERE x LIKE 'abc%%' ESCAPE '%';
} {4}
do_execsql_test icu-6.1 {
SELECT id FROM t1 WHERE x LIKE 'abc__' ESCAPE '_';
} {2}
```
If {4} and {2} are the number of rows returned, shouldn't they both be {2}?