During March 2026, Sunkan focused on backend development in PHP, addressing compatibility issues in the cucumber/gherkin repository. He delivered a targeted fix for the StringUtils substring method, updating its signature to accept a nullable length parameter in line with PHP 8.4’s stricter type handling. This change eliminated deprecation warnings and reduced runtime risk for downstream users, supporting a safer upgrade path. Sunkan’s work emphasized code maintainability and forward compatibility, demonstrating a strong grasp of PHP typing and refactoring. Although the period involved only one bug fix, the update contributed to long-term stability and reliability for PHP-based deployments.