Uncaught InvalidArgumentException: Unsupported argument type

[IvAil0]

I use the example from: https://www.swoole.co.uk/article/swoole-and-psr
I use last verison of Slim4 (v4.8), PHP 8.0.6, swoole (v4.6.7), psr-swoole-native (v0.0.4)
If I make a POST or GET request with data everything works as it should, but when I make a request whether POST or GET without data (body) it returns an error:

Fatal error: Uncaught InvalidArgumentException: Unsupported argument type in /var/www/vendor/imefisto/psr-swoole-native/src/ServerRequest.php:99
Stack trace:
#0 /var/www/vendor/slim/slim/Slim/Middleware/BodyParsingMiddleware.php(65): Imefisto\PsrSwoole\ServerRequest->withParsedBody(NULL)
#1 /var/www/vendor/slim/slim/Slim/MiddlewareDispatcher.php(147): Slim\Middleware\BodyParsingMiddleware->process(Object(Imefisto\PsrSwoole\ServerRequest), Object(Slim\Routing\RouteRunner))
#2 /var/www/vendor/slim/slim/Slim/Middleware/RoutingMiddleware.php(59): Psr\Http\Server\RequestHandlerInterface@anonymous->handle(Object(Imefisto\PsrSwoole\ServerRequest))
#3 /var/www/vendor/slim/slim/Slim/MiddlewareDispatcher.php(147): Slim\Middleware\RoutingMiddleware->process(Object(Imefisto\PsrSwoole\ServerRequest), Object(Psr\Http\Server\RequestHandlerInterface@anonymous))
#4 /var/www/vendor/slim/slim/Slim/MiddlewareDispatcher.php(81): Psr\Http\Server\RequestHandlerInterface@anonymous->handle(Object(Imefisto\PsrSwoole\ServerRequest))
#5 /var/www/vendor/slim/slim/Slim/App.php(215): Slim\MiddlewareDispatcher->handle(Object(Imefisto\PsrSwoole\ServerRequest))
#6 /var/www/cli/server.php(89): Slim\App->handle(Object(Imefisto\PsrSwoole\ServerRequest))
#7 {main}
thrown in /var/www/vendor/imefisto/psr-swoole-native/src/ServerRequest.php on line 99

[imefisto]

Good catch. The standard says the $data argument for the withParsedBody function can receive null:

Deserialization/parsing returns structured data, and, as such, this method ONLY accepts arrays or objects, or a null value if nothing was available to parse

I've added support for the case $data = null.