Pkg version list?

Indeed, thank you!

function available_versions(pkgname::AbstractString)
    registry = only(filter(r -> r.name == "General", Pkg.Registry.reachable_registries()))
    pkg = only(filter(pkg -> pkg.name == pkgname, collect(values(registry.pkgs))))
    return keys(Pkg.Registry.registry_info(pkg).version_info)
end
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