anchor.diff:  
       users.extraUsers = builtins.listToAttrs (map (name: {
         inherit name;
  -      value.uid = defnix.eval-support.calculate-id name;
  +      value.uid = cfg.defnix.eval-support.calculate-id name;
       }) cfg.users);
     };
   }
  
positive.code:     defnixos.strongswan-service = mkOption {
        description = "An already-composed strongswan defnixos service function";
  
        default = defnix.defnixos.services.strongswan;
  
        type = types.uniq types.unspecified;
      };
  
negative.code:     defnixos.services-to-nixos-config = mkOption {
        description = "An already-composed services-to-nixos-config defnixos library function";
  
        default = cfg.defnix.defnixos.nixos-wrappers.services-to-nixos-config;
  
        type = types.uniq types.unspecified;
      };
  