"Do we really need UB?" is the wrong question asked. "How much UB do we need to achieve the design goals of our language?". I think introducing UB while plann

"Do we really need UB?" is the wrong question asked. "How much UB do we need to achieve the design goals of our language?". I think introducing UB while planning tight integration in the language's tooling beforehand has lots of upside. Even GCC's ubsan does quite a good job, although created retrospectively.