memory leak

[yangbo-qc]

I wrote a test case and found that the memory has been rising, can you help me to see if it is a problem with my use or a memory leak, thank you.
But when I increase the number of tasks to 10000 level, this phenomenon will not appear.

system: MacOS 12.5 (m1)
go: 1.16
cron: github.com/robfig/cron/v3 v3.0.1
code:

func TestCron(t *testing.T) {
	c := cron.New(cron.WithSeconds())
	c.Schedule(cron.Every(time.Second), cron.FuncJob(func() {}))
	c.Start()

	go func() {
		for {
			var ms runtime.MemStats
			runtime.ReadMemStats(&ms)
			memory := int64(float64(ms.Alloc))
			routines := runtime.NumGoroutine()
			fmt.Printf(">> runtime: routines: %d, memory: %d\n", routines, memory)
			time.Sleep(time.Second)
		}
	}()

	sig := make(chan os.Signal, 1)
	signal.Notify(sig, syscall.SIGINT, syscall.SIGTERM)
	<-sig
	
	// Output:
	// >> runtime: routines: 4, memory: 156304
	// >> runtime: routines: 5, memory: 166616
	// >> runtime: routines: 5, memory: 167528
	// >> runtime: routines: 5, memory: 167968
	// >> runtime: routines: 5, memory: 168808
	// >> runtime: routines: 5, memory: 169632
	// ...
}

[yangbo-qc]

When I delete the relevant cron code, there will still be this phenomenon, I understand that it may not be the problem of the library