Worked on the alibaba/fastjson2 repository to address a critical issue in JSON deserialization involving array types when WriteClassName is enabled. Focused on Java development, the work involved refining type comparison logic within ObjectReaderImplObject.java to ensure accurate handling of byte arrays and object arrays during serialization and deserialization. Introduced a dedicated regression test to verify the fix and prevent future regressions, thereby improving reliability for users relying on WriteClassName. Emphasized robust unit testing and clear commit traceability, contributing to maintainable code and transparent change management. Demonstrated depth in JSON serialization/deserialization and a methodical approach to bug resolution.