util.smqueue: Refactor checkpoint logic and add tests The previous checkpoint logic used recursion, and the code was more complex than needed due to maintenance of the self._next_checkpoint field. This switches to a loop, which should be a bit more efficient, partly because there are fewer calls (although it was a tail call) and because table lookups can now be cached between each execution. _call_checkpoints() is now called unconditionally for every ack, which is simpler though adds a function call, it should be more than balanced out by the other changes.

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