package main

import "github.com/gookit/goutil/structs"

func maint() {
	type Config struct {
		Ints [3]int `default:"1,2,3"`
	}

	var c Config

	structs.InitDefaults(&c)
	// panic: reflect.Set: value of type []int is not assignable to type [3]int
}

if fv.Kind() == reflect.Array {
	for i := 0; i < valRv.Len(); i++ {
		fv.Index(i).Set(valRv.Index(i))
	}
}