structuredAttrs is enabled

trying https://registry.npmjs.org/skills/-/skills-1.5.21.tgz
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
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100 122.5k 100 122.5k   0      0  2.45M      0                              0
unpacking source archive /nix/var/nix/builds/nix-11371-1604072032/skills-1.5.21.tgz