无法解释为什么“ 55”转换为“ 7”

Question

package main

import (
    "fmt"
    "strconv"
)

func main() {
    v := "55"
    if s, err := strconv.Atoi(v); err == nil {
        fmt.Println(string(v)) // 55
        fmt.Println(s)         // 55
        fmt.Println(string(s)) // 7
    }
}

https://play.golang.org/p/8V1npFiC9iH

Answer 1

s is an integer with the value 55, which is the ASCII (and UTF-8) encoding of the character "7". That's what's printed from the last statement.