anchor.diff:  { stdenv
   , buildPythonPackage
   , fetchPyPi
  +, lib
   
   , aniso8601
   , flask
  
positive.code: #, rednose
  , tzlocal
  
  , channel ? "0.9"
  }:
  
  let
    inherit (stdenv.lib)
      optionals
      versionOlder;
  
  
negative.code:       version = "0.8.6";
        sha256 = "3bb76cc156b9a09da62396d82b29fa31e4f27cccf79528538fe7155cf2785593";
      };
      "latest" = {
        version = "0.10.1";
        sha256 = "129767ba6087a6f0a6d1bd901f4c11192b4d33fe80c38cf2a8a0b5f8dd6049e3";
      };
    };
  
  