print("Running double, super is", super)

return {
	recv = function(self)
		print("double.recv", "self", self, "super", super)
		local r1, err = super:recv()
		if not r1 then
			print(("first read failed: %s"):format(err))
			return nil, err
		end
		print(string.format("#1 double.recv() -> %q", r1))
		local r2, err = super:recv()
		if not r2 then
			print(("second read failed: %s"):format(err))
			return nil, err
		end
		print(string.format("#2 double.recv() -> %q", r2))
		return r1 .. r2
	end,
	send = function(self, data)
		if data == nil then
			print("send(nil)")
			return nil, "EOF"
		end
		print(string.format("double.send(%q)", data), "self", self, "super", super)
		local status, err = super:send(data)
		print(string.format("#1 double.send(%q)", data))
		if not status then
			return nil, err
		end
		local status, err = super:send(data)
		print(string.format("#2 double.send(%q)", data))
		if not status then
			return nil, err
		end
		return true
	end,
}