Worked on the xtyxtyx/go-git repository to enhance reliability in resource lifecycle management, focusing on the Writer.Close method. Addressed a bug by making Writer.Close idempotent, ensuring that the first error encountered during closure is cached and returned on subsequent calls, which prevents repeated execution of close logic and mitigates risks associated with multiple close attempts. This approach improved the stability of git object IO by strengthening error propagation and resource cleanup. Utilized Go and software engineering best practices to deliver maintainable changes, reducing potential failures in pipelines and tooling that depend on safe and predictable Close semantics for resource management.