anchor.diff:              default = "rgb";
               type = types.enum ["rgb" "bgr" "vrgb" "vbgr" "none"];
               description = ''
  -              Subpixel order, one of <literal>none</literal>,
  -              <literal>rgb</literal>, <literal>bgr</literal>,
  -              <literal>vrgb</literal>, or <literal>vbgr</literal>.
  +              Subpixel order.
               '';
             };
   
  
positive.code:           };
  
            style = mkOption {
              type = types.str // {
                check = flip elem ["none" "slight" "medium" "full"];
              };
              default = "full";
              description = ''
                TrueType hinting style, one of <literal>none</literal>,
  
negative.code:             default = "default";
              type = types.enum ["none" "default" "light" "legacy"];
              description = ''
                FreeType LCD filter.
              '';
            };
  
  