structuredAttrs is enabled

trying https://github.com/nix-community/nix-index-database/releases/download/2026-08-09-040451/index-aarch64-darwin
  % 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 56.32M 100 56.32M   0      0 21.19M      0   00:02   00:02         19.46M