Issue 0032866 implemented a workaround to run Slim 3.x on PHP 8.1 using a custom error handler to catch deprecation warnings.
Some further adjustments are needed to ignore new warnings, some of which are triggered before the error handler is in place.
Deprecated: Implicitly marking parameter ... as nullable is deprecated, the explicit nullable type must be used instead
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Slim\App::subRequest(): $response
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Slim\MiddlewareAwareTrait::seedMiddlewareStack(): $kernel
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Slim\DeferredCallable::__construct(): $container
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Slim\Router::__construct(): $parser
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Slim\RouteGroup::__invoke(): $app
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Slim\Http\Response::__construct(): $headers
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