Floris Westerman refined the Optics Plugin’s symbol resolution for the arrow-kt/arrow repository, focusing on the Kotlin Symbol Processing (KSP) workflow. He introduced finer-grained validation to improve how the plugin determines which symbols to defer during processing, addressing the challenge of misclassifying annotations and function declarations as class declarations. By adjusting the symbol classification logic, Floris enhanced both the accuracy and robustness of the plugin’s core functionality. His work leveraged expertise in Kotlin, annotation processing, and KSP plugin development. The depth of the changes reflects a targeted approach to improving the reliability of symbol resolution without introducing new bugs.