Jan Tvrdík enhanced generic parameter handling in the phpstan/phpstan-src repository by enabling defaults for template parameters to reference other template parameters within ClassReflection. This work focused on improving the resolution of template types and advancing type inference in generic programming contexts. Using PHP and leveraging skills in generic programming and type inference, Jan’s update strengthened the static analysis pipeline, making it more accurate and maintainable for users working with advanced generics. The changes addressed a nuanced aspect of generic code usability, allowing safer refactoring and reducing friction for developers who rely on PHPStan’s static analysis capabilities in complex codebases.