structuredAttrs is enabled

trying https://github.com/sipyourdrink-ltd/bernstein/archive/refs/tags/v3.15.1.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  9.01M   0  9.01M   0      0  7.39M      0           00:01          8.91M
100 16.25M   0 16.25M   0      0  7.22M      0           00:02          7.95M
100 20.99M   0 20.99M   0      0  7.29M      0           00:02          7.95M
100 20.99M   0 20.99M   0      0  7.29M      0           00:02          7.95M
100 20.99M   0 20.99M   0      0  7.29M      0           00:02          7.95M
unpacking source archive /nix/var/nix/builds/nix-25203-311484410/download.tar.gz