Over a two-month period, Chris Loomis contributed targeted improvements to the Subaru-PFS/datamodel repository, focusing on stability and maintainability. He addressed a critical compatibility issue by updating PfsConfig to use np.nan instead of the deprecated np.NaN, ensuring correct nanmean calculations with NumPy 2.x and reducing future upgrade risks. In a separate effort, he streamlined the installation process by removing an obsolete ICS workaround from the shell-based setup script, simplifying deployment and eliminating a known failure point. His work demonstrated careful attention to codebase resilience, leveraging Python, NumPy, and shell scripting to deliver well-scoped, future-proof enhancements.