devshell broken on nixpkgs-unstable

[womfoo]

looks like a recent change in unstable NixOS/nixpkgs#386208 broke the devshell/nixago integration

nix build .#x86_64-linux.repo.shells.default
...
       … while evaluating derivation 'devshell'
         whose name attribute is located at /nix/store/wlhsnrq6g5avc7z21lfivqypaq5fy2wn-source/nix/mkNakedShell.nix:32:11

       … while evaluating attribute 'args' of derivation 'devshell'
         at /nix/store/wlhsnrq6g5avc7z21lfivqypaq5fy2wn-source/nix/mkNakedShell.nix:40:3:
           39|   # Bring in the dependencies on `nix-build`
           40|   args = [
             |   ^
           41|     "-ec"

       … while evaluating the option `devshell.startup.nixago-setup-hook.text':

       … while evaluating definitions from `<unknown-file>':

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: cannot coerce a set to a string: { __functionArgs = «thunk»; __functor = «thunk»; }