structuredAttrs is enabled

trying https://github.com/sipyourdrink-ltd/bernstein/archive/refs/tags/v3.19.0.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 10.50M   0 10.50M   0      0  8.41M      0           00:01         10.38M
100 18.75M   0 18.75M   0      0  8.34M      0           00:02          9.32M
100 22.42M   0 22.42M   0      0  8.33M      0           00:02          9.32M
100 22.42M   0 22.42M   0      0  8.33M      0           00:02          9.32M
100 22.42M   0 22.42M   0      0  8.33M      0           00:02          9.32M
unpacking source archive /nix/var/nix/builds/nix-20933-4050427560/download.tar.gz