Refactor implicitly nullable parameter types #386
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Implicitly nullable parameter types are going to be deprecated in PHP 8.4
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Implicitly nullable parameter types are going to be deprecated in PHP 8.4 (https://wiki.php.net/rfc/deprecate-implicitly-nullable-types).
This PR makes them nullable explicitly.
Since nullable types were added in PHP 7.1 this PR drops support for PHP 7.0.