ofDelayedFunc further improved

of.go

@@ -20,13 +20,13 @@ func OfDelayedFunc[T any](delayFunc func(value T) time.Duration, values ...T) <-
 	out := make(chan T, len(values))
 
 	go func(out chan T, values []T) {
+		defer close(out)
 		for i, value := range values {
 			out <- value
 			if i < len(values)-1 {
 				time.Sleep(delayFunc(value))
 			}
 		}
-		close(out)
 	}(out, values)
 
 	return out