- use an inventory flag to decide what items are slipped by DF_NO_HEALTH and DF_NO_ARMOR. With all the changes over the last 10 years this had become too spotty.

- use an enum type for ItemFlags, just like it was done for actor flags. Since the flag word is almost full it may soon be necessary to add a second one and then this kind of security check may become necessary.

src/scripting/thingdef_data.cpp

@@ -430,6 +430,8 @@ static FFlagDef InventoryFlagDefs[] =
 	DEFINE_FLAG(IF, TRANSFER, AInventory, ItemFlags),
 	DEFINE_FLAG(IF, NOTELEPORTFREEZE, AInventory, ItemFlags),
 	DEFINE_FLAG(IF, NOSCREENBLINK, AInventory, ItemFlags),
+	DEFINE_FLAG(IF, ISARMOR, AInventory, ItemFlags),
+	DEFINE_FLAG(IF, ISHEALTH, AInventory, ItemFlags),
 
 	DEFINE_DUMMY_FLAG(FORCERESPAWNINSURVIVAL, false),