Seen on https://gerrit.wikimedia.org/r/c/utfnormal/+/770668
https://integration.wikimedia.org/ci/job/composer-package-php80-docker/7397/console
02:38:20 1) Warning 02:38:20 The data provider specified for UtfNormalTest::testInvariant is invalid. 02:38:20 InvalidArgumentException: Asked for code outside of range (55296) 02:38:20 /src/src/Utils.php:47 02:38:20 /src/tests/UtfNormalTest.php:131