FWIW Go doesn't have an implementation of XAES in the stdlib yet, there's only the reference implementation in C2SP.
I get that you want to keep up to date with security, but the entire crypto tree is basically a playground for Filippo Valsorda at this point. Meanwhile stuff that I actually need like CMAC is "won't fix"
Elixir can call Erlang/OTP modules directly, so they also have access to that same module. Erlang/OTP is a hard dependency for Elixir afaik.
Trash other peoples' work as "playground" activity, and demand they work on something else for free.