local newGetItemArmorType = GetItemArmorType
GetItemArmorType = function(bagId, slotIndex)
    if type(bagId) == "string" then
        return GetItemLinkArmorType(bagId)
    else
        return newGetItemArmorType(bagId, slotIndex)
    end
end
 
local newGetItemWeaponType = GetItemWeaponType
GetItemWeaponType = function(bagId, slotIndex)
    if type(bagId) == "string" then
        return GetItemLinkWeaponType(bagId)
    else
        return newGetItemWeaponType(bagId, slotIndex)
    end
end

local inventory_mt =
{
    __index = function(self, key)
        if key == "numSlots" then
            return GetBagSize(self.backingBag)
        elseif key == "numUsedSlots" then
            return GetNumBagUsedSlots(self.backingBag)
        end
    end
}
for i, inventory in pairs(PLAYER_INVENTORY.inventories) do
    setmetatable(inventory, inventory_mt)
end