I way want to confirm different on mbstring PHP 8.1 or newer and
PHP 8.0 or older, but when I port to PHP 8.0 from PHP 8.1 or newer
phpt files, it stopped die() function when test failed. I want to
make a list, so I don't want to stop it.
If you execute full test, set $testFailedLimit to -1 in
encoding_tests.inc.