structuredAttrs is enabled

trying https://github.com/sipyourdrink-ltd/bernstein/archive/refs/tags/v3.20.0.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
  0      0   0      0   0      0      0      0                              0
  0      0   0      0   0      0      0      0                              0

  0      0   0      0   0      0      0      0                              0
100  5.53M   0  5.53M   0      0  4.49M      0           00:01          5.37M
100 18.76M   0 18.76M   0      0  8.40M      0           00:02          9.24M
100 24.19M   0 24.19M   0      0  8.41M      0           00:02          9.24M
100 24.19M   0 24.19M   0      0  8.41M      0           00:02          9.24M
100 24.19M   0 24.19M   0      0  8.41M      0           00:02          9.24M
unpacking source archive /nix/var/nix/builds/nix-96027-1414255113/download.tar.gz