One could fairly easy imagine a world where mimalloc would be a strict improvement over the current macOS allocator and evaluating it as a drop-in replacement might be considered instead... (disregarding legals and NIH aspects of course). Just saying But that's off-topic (on a sidenote, we have it on our to-do list to evaluate mimalloc on Ub...

This discussion about the evolution process is carried over from The @contributor-experience-workgroup is currently working on generalizing the Swift Evolution process to apply to more areas of project development. You can read about this effort here: The idea is that other steering groups should facilitate their own Swift Evolution process...