Save repeated values in a list using Datastore2

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Hello!
I’ve been having an issue with saving tables when there are multiple values in the table that are equal to each other. For example, if we have a table of {“a”,“b”,“b”,“c”}, only {“a”,“b”,“c”} get saved to Datastore2. I’m new to datastores in general so sorry if I made a common mistake.

Here’s my script:

local Datastore = require(game.ServerScriptService.DataStore2)
local IDs = require (game.ServerStorage.Items["!IDs"])
local players = game.Players

Datastore.Combine("DATA", "inventoryPR")

players.PlayerAdded:Connect(function(player)
	local inventoryDatastore = Datastore("inventoryPR",player)
	local invTempleate = game.ServerStorage:WaitForChild("Inventory"):Clone()
	invTempleate.Parent = player
	local invTable = inventoryDatastore:GetTable({})
	print(invTable)
	
	for i,itemSTR in pairs(invTable) do -- Inserts saved items into inventory
		local item = IDs[itemSTR][1]
		item.Parent = player:WaitForChild("Inventory")[item.Type.Value]
	end
end)

players.PlayerRemoving:Connect(function(player)
	local inventoryDatastore = Datastore("inventoryPR",player)
	local playerInv = player:WaitForChild("Inventory")
	local invSlots = {playerInv:WaitForChild("Food"),playerInv:WaitForChild("Materials"),playerInv:WaitForChild("Tools")}
	local invToSave = {}
	for i,slot in pairs(invSlots) do -- Gets a table to save later
		for i,item in pairs(slot:GetChildren()) do
			if item:FindFirstChild("StringID") then
				table.insert(invToSave,item.StringID.Value)
			end
		end
	end
	print(invToSave)
	inventoryDatastore:Set(invToSave)
end)
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