[go-nuts] about function argument type infer?

[xie cui]

package main

import (
        "fmt"
        "reflect"
)
import "golang.org/x/exp/constraints"
// Double returns a new slice that contains all the elements of s, doubled.
func Double[E constraints.Integer](s []E) []E {
        r := make([]E, len(s))
        for i, v := range s {
                r[i] = v
        }
        return r
}

func main() {
        // MySlice is a slice of ints.
        type MySlice []int

        // The type of V1 will be []int, not MySlice.
        // Here we are using function argument type inference,
        // but not constraint type inference.
        var V1 = Double(MySlice{1})
        fmt.Println(reflect.TypeOf(V1).String())
}

why use function argument type infer, and why function argument type infer 
int to []int?

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