Worked on enhancing PHPStan’s core repository, phpstan/phpstan-src, by implementing support for PHP 8.3’s updated cloning semantics. Focused on enabling reinitialization of readonly properties within the __clone method, this feature improved static analysis accuracy and ensured compatibility with the latest PHP version. The approach involved object-oriented programming techniques and careful static analysis to align the codebase with evolving language features. No major bugs were addressed during this period, as the primary goal was to reinforce code stability and readiness for PHP 8.3. The work demonstrated a targeted, well-scoped update using PHP and static analysis expertise within a complex codebase.