Worked on the minio/minio-go repository to address a critical issue in the CopyObject operation, focusing on improving data integrity and downstream caching reliability. Delivered a targeted bug fix that ensures the ETag for copied objects is accurately extracted from the direct CopyObject response object rather than from response headers. This adjustment aligns with best practices in API development and object storage, reducing the risk of cache inconsistencies and integrity issues for users. The solution was implemented in Go, with careful attention to testability and scope, reflecting a methodical approach to maintaining API correctness and reliability within the object storage ecosystem.