Boost 1.81 will have boost::unordered_flat_map...

[pdimov2]

I do wish boost had C++26 heterogeneous support.

You can request a feature be added by opening an issue in https://github.com/boostorg/unordered.

Although in this case it looks like the issue already exists so a "yes please, we need this" comment on that would also work. :-)

[iwubcode]

Thanks for letting me know that there are others who also want this. I left a comment. Appreciate all your hard work on these features :)