Jonathan Lim refactored the CBOR decoding logic for memoized data structures in the pragma-org/amaru repository, focusing on supporting both legacy and modern transaction representations. Using Rust and leveraging skills in CBOR and Protocol Buffers, he introduced new decoding functions that improved the handling of transaction outputs, as well as the processing of datum and script information. His work enhanced the robustness and maintainability of the codebase by reducing edge-case failures and simplifying future enhancements. The changes ensured accurate interpretation of transaction outputs across formats, minimizing production risk and providing a solid foundation for ongoing development in serialization workflows.