my urfave/cli version is

( v.2.3.0)

Checklist

• Are you running the latest v2 release? The list of releases is here.
• Did you check the manual for your release? The v2 manual is here
• Did you perform a search about this problem? Here's the Github guide about searching.

Dependency Management

• My project is using go modules.
• My project is using vendoring.
• My project is automatically downloading the latest version.
• I am unsure of what my dependency management setup is.

Describe the bug

I'm not sure if this is a bug, but the behavior is unexpected.

To reproduce

1. set variable. For examplle, gcount := 20

2. use pointer for destination

&cli.IntFlag{
				Name:        "power",
				Usage:       "count for goroutines",
				Destination: &gcount,
				DefaultText: "20",
			},

3. Println in Action

Action: func(context *cli.Context) error {
			log.Println(gcount)

			return nil
		},

example application - https://play.golang.org/p/aXyfZus7pWi

package main

import (
	"log"
	"os"
	
	"github.com/urfave/cli/v2"
)

func main() {
	gcount := 20
	app := &cli.App{
		Name:  "leviathan",
		Usage: "pentest util",
		UsageText: "leviathan [command options] address (ip or host)",
		Flags: []cli.Flag{
			&cli.IntFlag{
				Name:        "power",
				Usage:       "count for goroutines",
				Destination: &gcount,
				DefaultText: "20",
			},
		},
		Action: func(context *cli.Context) error {
		        log.Println(gcount)
		        return nil
		},
	}

	err := app.Run(os.Args)
	if err != nil {
		log.Fatal(err)
	}

}

Observed behavior

gcount=0

Expected behavior

gcount=20

PS

After reading the documentation, I realized that I had to do this

Flags: []cli.Flag{
			&cli.IntFlag{
				Name:        "power",
				Usage:       "count for goroutines",
				//Destination: &gcount,
				DefaultText: "20",
				Value: 20,
			},
		},

Action: func(context *cli.Context) error {
            gcount := context.Int("power")

But I still think that the behavior is unexpected in my case.