Because of this PR: #1463
Many of my tests now failing with:

exception [err:TypeError("PhpSpec\Wrapper\Subject::beConstructedThrough(): Argument #1 ($factoryMethod) must be of type array|string, Closure given, called in /var/www/symfony/vendor/phpspec/phpspec/src/PhpSpec/ObjectBehavior.php on line 155")] has been thrown.