anchor.diff:    meta = with lib; {
       description = "Functions for fast computation of Levenshtein distance and string similarity";
       homepage = "https://github.com/maxbachmann/Levenshtein";
  +    changelog = "https://github.com/maxbachmann/Levenshtein/blob/${src.rev}/HISTORY.md";
       license = licenses.gpl2Plus;
       maintainers = with maintainers; [ fab ];
     };
  
positive.code: 
  buildPythonPackage rec {
    pname = "levenshtein";
    version = "0.19.3";
    format = "pyproject";
  
    disabled = pythonOlder "3.6";
  
negative.code:     owner = "maxbachmann";
      repo = "Levenshtein";
      rev = "refs/tags/v${version}";
      hash = "sha256-zVYfErh9tts3yPgXqqeX6xp8o+gLd7nN64+Ml6YZfjE=";
    };
  
    nativeBuildInputs = [
  