LasTshaMAN

// We'll have a slot for each millisecond.
const slotCnt = int(time.Second / time.Millisecond)

type RateLimiter struct {
	// rpsBufferMs is a ring buffer that contains a slot per millisecond.
	rpsBufferMs [slotCnt]int

	lastRpsValue int
	lastSlot     int
	lastTime     time.Time