anchor.diff:        type = with types; nullOr str;
         default = null;
         example = "/path/to/fullchain.pem";
  -      description = "Path to TLS certificate to use for connections to ${manref "public-inbox-${proto}d" 1}.";
  +      description = lib.mdDoc "Path to TLS certificate to use for connections to {manpage}`public-inbox-${proto}d(1)`.";
       };
       key = mkOption {
         type = with types; nullOr str;
         default = null;
         example = "/path/to/key.pem";
  -      description = "Path to TLS key to use for connections to ${manref "public-inbox-${proto}d" 1}.";
  +      description = lib.mdDoc "Path to TLS key to use for connections to {manpage}`public-inbox-${proto}d(1)`.";
       };
     };
   
  
positive.code: let
    cfg = config.services.public-inbox;
    stateDir = "/var/lib/public-inbox";
  
    manref = name: vol: "<citerefentry><refentrytitle>${name}</refentrytitle><manvolnum>${toString vol}</manvolnum></citerefentry>";
  
    gitIni = pkgs.formats.gitIni { listsAsDuplicateKeys = true; };
    iniAtom = elemAt gitIni.type/*attrsOf*/.functor.wrapped/*attrsOf*/.functor.wrapped/*either*/.functor.wrapped 0;
  
negative.code:       args = mkOption {
          type = with types; listOf str;
          default = [];
          description = lib.mdDoc "Command-line arguments to pass to {manpage}`public-inbox-mda(1)`.";
        };
      };
      postfix.enable = mkEnableOption "the integration into Postfix";
  