Roblox SubtractAsync and UnionAsync

-- Minis SubtractAsync
-- https://devforum.roblox.com/t/new-roblox-in-game-csg-api-is-now-available/174085

function GetSub(Part,List)
	local Success = false
	while Success == false do
		local Sub = Part:SubtractAsync(List)
		if Sub == nil then
			-- It Hasnt worked
			print("Union is nil")
		else
			local Success = true
			return Sub
		end
	end
end

function GetUnion(Part,List)
	local Success = false
	while Success == false do
		local Union = Part:UnionAsync(List)
		if Union == nil then
			-- It Hasnt worked
			print("Union is nil")
		else
			local Success = true
			return Union
		end
		wait(1)
	end

end

function ActualiseUnion(Part,List,Union)
	if Union == nil then
		-- An Error Has Occured
	else
		-- There is a Union
		-- Remove Subtracts
		for i = 1,#List do
			List[i]:Destroy()
		end
		-- Remove MainPart
		local Cf = Part.CFrame
		local P = Part.Parent
		Part:Destroy()
		-- Place Union
		Union.CFrame = Cf
		Union.Parent = P
	end
end