anchor.diff:  
   buildPythonPackage rec {
     pname = "asdf";
  -  version = "2.10.1";
  -  disabled = pythonOlder "3.6";
  +  version = "2.11.0";
     format = "pyproject";
  +
  +  disabled = pythonOlder "3.7";
   
     src = fetchPypi {
       inherit pname version;
  -    sha256 = "sha256-9+Vp8ps3I5Oe/sgWTrLtcnS91ICwsoPXWDPw9Z0QhAk=";
  +    hash = "sha256-FEWXGSkneduhO9+YlzrZvpJHUsI7TeagVLwBdMEIRvw=";
     };
   
  -  nativeBuildInputs = [ setuptools-scm ];
  +  nativeBuildInputs = [
  +    setuptools-scm
  +  ];
   
     propagatedBuildInputs = [
  +    asdf-standard
  +    asdf-transform-schemas
       jmespath
       jsonschema
       numpy
  
positive.code:     export PY_IGNORE_IMPORTMISMATCH=1
    '';
  
    pythonImportsCheck = [ "asdf" ];
  
    meta = with lib; {
      description = "Python tools to handle ASDF files";
      homepage = "https://github.com/spacetelescope/asdf";
      license = licenses.bsd3;
      maintainers = with maintainers; [ costrouc ];
    };
  
negative.code: { lib
  , asdf-standard
  , asdf-transform-schemas
  , astropy
  , buildPythonPackage
  , fetchPypi
  , importlib-resources
  , jmespath
  , jsonschema
  , lz4
  , numpy
  , packaging
  , pytest-astropy
  