如何在Golang中使用sort.Strings()进行不区分大小写的排序？

package main

import (
    "fmt"
    "sort"
    "strings"
)

type CaseInsensitive []string

func (s CaseInsensitive) Len() int {
    return len(s)
}

func (s CaseInsensitive) Less(i, j int) bool {
    return strings.ToLower(s[i]) < strings.ToLower(s[j])
}

func (s CaseInsensitive) Swap(i, j int) {
    s[i], s[j] = s[j], s[i]
}

func main() {
    strs := []string{"apple", "Banana", "cherry", "DURIAN"}
    sort.Sort(CaseInsensitive(strs))
    fmt.Println(strs)
}