anchor.diff:      owner = "TkTech";
       repo = pname;
       rev = "v${version}";
  -    sha256 = "0blp6gb7q3f7if326xard8zlfg2rcmb3a7mxvaxgkvxigipjb9af";
  +    hash = "sha256-4Ojn3t0EbOVdrYEiY8JegJuvW9sz8jt9tKFwOluiGQo=";
     };
   
     checkInputs = [
  
positive.code: 
  buildPythonPackage rec {
    pname = "mutf8";
    version = "1.0.5";
  
    disabled = pythonOlder "3.6";
  
  
negative.code:     pytest
    '';
  
    pythonImportsCheck = [
      "mutf8"
    ];
  
    meta = with lib; {
      description = "Fast MUTF-8 encoder & decoder";
  