Fabrice Le Goff refactored user-defined literal operators in the andiwand/acts library to ensure compatibility with clang-20, focusing on C++ and library development. He standardized the hashing function signature and updated unit literal constants, which improved naming consistency and simplified future maintenance. By resolving syntax issues specific to modern toolchains, Fabrice enhanced build reliability and maintainability for the project. His work addressed the need for up-to-date language support and cleaner code structure, resulting in a more robust library. The changes were implemented in C++ and reflected a targeted, in-depth approach to evolving the codebase for current compiler standards.