Worked on the Guardsquare/proguard-core repository to enhance zip file handling by introducing a dedicated getter for retrieving the exact uncompressed size of zip entries. This feature, implemented in Java, replaced the previous approximation method and provided a more accurate API for downstream consumers. The approach maintained backward compatibility while improving the precision of resource planning, validation, and analytics related to zip assets. By focusing on API clarity and data accuracy, the work enabled better integration with existing Java-based systems and improved the reliability of metrics derived from zip file processing, reflecting a targeted and thoughtful engineering contribution within the project.