structuredAttrs is enabled

trying https://github.com/sipyourdrink-ltd/bernstein/archive/refs/tags/v3.10.0.tar.gz
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
  0      0   0      0   0      0      0      0                              0
100 23.89M   0 23.89M   0      0  8.96M      0           00:02         10.08M
unpacking source archive /nix/var/nix/builds/nix-49028-4043461393/download.tar.gz