anchor.diff:  , pathlib
   , plac
   , preshed
  +, pydantic
   , srsly
   , tqdm
   , wasabi
  
positive.code:     preshed
      srsly
      tqdm
      wasabi
    ] ++ lib.optional (pythonOlder "3.4") pathlib;
  
  
negative.code:   doCheck = false;
  
    postPatch = ''
      substituteInPlace setup.cfg \
        --replace "blis>=0.4.0,<0.8.0" "blis>=0.4.0,<1.0" \
        --replace "pydantic>=1.7.1,<1.8.0" "pydantic~=1.7"
    '';
  
    checkPhase = ''
  