I think timtadh's jab about you not knowing your tools wasn't about the structs with a type field but about the .(float64) in case float64: fmt.Pri

I think timtadh's jab about you not knowing your tools wasn't about the structs with a type field but about the .(float64) in case float64: fmt.Printf("%f\n", v.(float64)) which can be simplified to case float64: fmt.Printf("%f\n", v)