--- vendor/smalot/cups-ipp/src/Builder/Builder.php.orig	2018-12-24 15:14:19.096931649 -0800
+++ vendor/smalot/cups-ipp/src/Builder/Builder.php	2018-12-24 15:13:15.087996326 -0800
@@ -194,7 +194,11 @@
                         break;
 
                     case 'enum':
-                        // @todo: alter specials types
+                        if (is_numeric($value)) {
+                          $value = pack('N', $value);
+                        } else {
+                          throw new CupsException('Non-numeric enum value not supported for : "'.$name.'".');
+                        }
                         break;
 
                     case 'range_of_integers':