During September 2025, Lapateen contributed to the JetBrains/phpstorm-stubs repository by enhancing performance and static analysis compatibility for PHP 8.4. Lapateen implemented the #[Pure] attribute across mbstring functions, signaling to static analyzers and the compiler that these methods are side-effect-free. This change enables more accurate static analysis and potential optimizations in both runtime and IDE environments. The work required a strong understanding of PHP 8.4 attributes, annotation standards, and stub maintenance practices. While no bugs were addressed during this period, Lapateen’s focused contribution demonstrated depth in PHP software development and Git-based collaborative workflows within open source projects.