This isn't really an issue of Invoker, but should_invoke_callable_with_optional_parameter_before_required_parameter fails on PHP 8.2 due to PHP tightening up optional-before-required param behavior. If that's desired functionality in Invoker even >= PHP 8.2 OTOH, code changes will be required. But skipping that test on 8.2, documenting the change, and updating the test grid to include 8.1 and 8.2, seems like a reasonable enough response from here.