During February 2026, this developer contributed to the swiftlang/swift-evolution repository by designing and implementing the Dictionary.mapValuesWithKeys API using Swift. The feature enables efficient transformation of dictionary values with access to their keys, optimizing data-processing workloads by avoiding unnecessary rehashing and reducing CPU overhead. Their approach emphasized algorithm design and data structure efficiency, aligning the new API with Swift Collections and laying the foundation for future integration with OrderedDictionary. They also updated documentation to improve developer experience and API discoverability. The work focused on feature delivery, code quality, and cross-repository collaboration, with no major bugs reported during this period.