Creating a function with an unknown number of arguments; arg == nil?

I want to create a customized print() function that would print the arguments to the console and then also put them in a StringValue. I read an article on how to do that. My code is as the following:

function printConsole(...)
	coroutine.wrap(function(arg)
		local toPrint=""
		print(arg)
		for _,v in pairs(arg) do
			toPrint=toPrint..tostring(v)
		end
		print(toPrint)
		workspace.ToPrint.Value=workspace.ToPrint.Value..toPrint.."\n"
	end)(arg)
end
print("Hi", "there!")

At the for loop it breaks because arg is nil, not a table. At print(arg) it says: "Hi" so it thinks arg is a string.