anchor.diff:  , jsonref
   , jsonschema
   , matplotlib
  +, nbconvert
   , nbformat
   , pandas
   , pathtools
  
positive.code:     owner = pname;
      repo = "client";
      rev = "v${version}";
      hash = "sha256-Fq+JwUEZP1QDFKYVyiR8DUU0GQV6fK50FW78qaWh+Mo=";
    };
  
    # setuptools is necessary since pkg_resources is required at runtime.
  
negative.code:     scikit-learn
      tqdm
    ];
  
    disabledTestPaths = [
      # Tests that try to get chatty over sockets or spin up servers, not possible in the nix build environment.
  