Added support of 0 limit (passthrough)

throttle.go

@@ -38,6 +38,11 @@ func (t *Throttler[T]) Do(fn Fn[T]) (T, error) {
 
 // advance updates the throttler state, advancing the window or incrementing the counter as necessary.
 func (t *Throttler[T]) advance() {
+	// pass through
+	if t.limit == 0 {
+		return
+	}
+
 	now := time.Now()
 
 	// if this is the first operation, initialize the window

throttle_test.go

@@ -18,6 +18,10 @@ func TestThrottler_Wait_Consistent(t *testing.T) {
 		Limit uint64
 		Calls int
 	}{
+		{
+			Limit: 0,
+			Calls: 10,
+		},
 		{
 			Limit: 1,
 			Calls: 10,
@@ -70,6 +74,10 @@ func TestThrottler_Wait_Consistent(t *testing.T) {
 			expected := useCase.Limit
 
 			for _, actual := range groups {
+				if expected == 0 {
+					expected = uint64(useCase.Calls)
+				}
+
 				if actual > expected {
 					t.Fatal(fmt.Sprintf("Expected %d per second, but got %d", expected, actual))
 				}