I think [slotmap](https://docs.rs/slotmap/latest/slotmap/ https://docs.rs/slotmap/latest/slotmap/) could be on there somewhere, I have found it very useful for

I think [slotmap](https://docs.rs/slotmap/latest/slotmap/ https://docs.rs/slotmap/latest/slotmap/) could be on there somewhere, I have found it very useful for various projects. I guess it could be listed under datastructures?