net.stun: Fix parsing of STUN packets with 0-length attributes Not sure where the '20' came from. RFC 8489 defines attributes as simple TLVs, with the type+length header being always 16 bits (4 bytes). The branch for non-zero lengths already uses the correct header size.

if not math.type then

	local function math_type(t)
		if type(t) == "number" then
			if t % 1 == 0 and t ~= t + 1 and t ~= t - 1 then
				return "integer"
			else
				return "float"
			end
		end
	end
	_G.math.type = math_type
end