[go-nuts] weird?

[T L]

package main

import "fmt"
import "reflect"

type Age int
func (age Age) CanDrink() bool {
    age++
    return age >= 18
}

func main() {
    var age Age = 11
    
    Age.CanDrink(age)
    // (*Age).CanDrink(age) // cannot use age (type Age) as type *Age in 
argument to (*Age).CanDrink
    (*Age).CanDrink(&age)
    fmt.Println(age) // 11
    
    fmt.Println(reflect.TypeOf(Age.CanDrink)) // func(main.Age) bool
    fmt.Println(reflect.TypeOf((*Age).CanDrink)) // func(*main.Age) bool
}

Why is the parameter of (*Age).CanDrink is a pointer? It is not reasonable.

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