Canonicalizing array comparator leaks notices

[J. King]

class TestTest extends \PHPUnit\Framework\TestCase {
    public function testEmitNotice(): void {
        $exp = [1, new \stdClass];
        $act = [1, new \stdClass];
        $this->assertEqualsCanonicalizing($exp, $act);
    }
}

PHPUnit 9.0.1 by Sebastian Bergmann and contributors.

PHP Notice:  Object of class stdClass could not be converted to int in ./vendor/sebastian/comparator/src/ArrayComparator.php on line 49
PHP Notice:  Object of class stdClass could not be converted to int in ./vendor/sebastian/comparator/src/ArrayComparator.php on line 50
.                                                                   1 / 1 (100%)

Time: 174 ms, Memory: 8.00 MB

OK (1 test, 1 assertion)

[Sebastian Bergmann]

I am not sure there is anything that I can do here apart from suppressing the notice. sort() simply should not be used on arrays that contain objects.