Chuck Duck focused on data integrity within the PolicyEngine/policyengine-us repository, updating Arkansas income tax bracket data to align with 2024 legislative changes. He used YAML to revise rate definitions, removing outdated references such as HB1001 to ensure regulatory compliance and data accuracy. His work emphasized documentation and changelog discipline, providing clear traceability for downstream teams and maintaining transparency in policy data updates. By addressing a critical bug rather than adding new features, Chuck demonstrated a detail-oriented approach to government regulations and tax policy, ensuring that customers relying on this data benefit from improved accuracy and reduced risk of data drift.