Golang将字符串转换为int64

strconvAtoi

// Atoi is shorthand for ParseInt(s, 10, 0).
func Atoi(s string) (i int, err error) {
        i64, err := ParseInt(s, 10, 0)
    return int(i64), err
}

The ParseInt actually returns an int64:

func ParseInt(s string, base int, bitSize int) (i int64, err error){
     //...
}

So if I want to get an int64 from a string, should I avoid using Atoi, instead use ParseInt? Or is there an Atio64 hidden somewhere?