Use for any question about mutation testing in C or C++, or when a C/C++ suite has high coverage but bugs still ship: sets up Mull for Clang builds (version-matched package, -fpass-plugin flags, CMake, mull-runner, mutators, path filters) and runs it in GitHub Actions. Other languages: stryker-mutation, stryker-net-mutation, pitest-mutation, mutmut-mutation.