anchor.diff:  
     py = python3.override {
       # Put packageOverrides at the start so they are applied after defaultOverrides
  -    packageOverrides = lib.foldr lib.composeExtensions (self: super: { }) (defaultOverrides);
  +    packageOverrides = lib.foldr lib.composeExtensions (self: super: { }) defaultOverrides;
     };
   
   in
  
positive.code:     html2text
      python-dotenv
      python-frontmatter
      requests
      setuptools
      tinydb
      validators
      werkzeug
      wtforms
    ];
  
  
negative.code: let
    defaultOverrides = [
      (self: super: {
        wtforms = super.wtforms.overridePythonAttrs (oldAttrs: rec {
          version = "2.3.1";
          pname = "WTForms";
  
          src = super.fetchPypi {
            inherit pname version;
            sha256 = "sha256-hhoTs65SHWcA2sOydxlwvTVKY7pwQ+zDqCtSiFlqGXI=";
          };
  
          doCheck = false;
        });
      })
  