[Lua] Clone a table without references

tableClone.lua

-- creates a full copy of a table
-- changing the value of copied table doesn't touch the original anymore
-- warning: using methods on "copied" userdata will still affect original object

local a = {
	["abc"] = {1, 2},
	[1] = {4, {2}}
}

function cloneTable(t)
	local o = {}
	
	for k, v in pairs(t) do
		if type(v) == "table" then
			o[k] = cloneTable(v)
		else
			o[k] = v
		end
	end
	
	return o
end

-- create a copy of table a without references to it
local b = cloneTable(a)

-- test if it works
b[1][2][1] = 3
print(a[1][2][1])