lib/mail/parsers/content_disposition.treetop in mail-2.2.7 vs lib/mail/parsers/content_disposition.treetop in mail-2.2.9

@@ -13,10 +13,10 @@
         end
       }
     end
     
     rule disposition_type
-      "inline" / "attachment" / extension_token / ''
+      [iI] [nN] [lL] [iI] [nN] [eE] / [aA] [tT] [tT] [aA] [cC] [hH] [mM] [eE] [nN] [tT] / extension_token / ''
     end
     
     rule extension_token
       ietf_token / custom_x_token
     end