Worked on security hardening for the protocolbuffers/protobuf repository by removing the unused _upb_NoLocaleStrtod() function, which reduced the potential for stack-buffer-overflow vulnerabilities and eliminated dead parser code. This effort involved deleting related C source and header files, updating Bazel and CMake build configurations, and ensuring consistency across PHP and Ruby upb amalgamations. The work focused on C and C++ programming, code refactoring, and applying security best practices. Comprehensive verification steps, including code searches and diff checks, ensured all references were removed, resulting in a cleaner, safer codebase and improved maintainability as part of ongoing incremental risk reduction.