cli.StringSliceFlag and default value

[vieux]

Hello,
I define my flag as follow:

flFilter = cli.StringSliceFlag{
        Name:  "filter",
        Value: &cli.StringSlice{"flag1", "flag2", "flag3"},
}

If I start my binary without arguments, c.StringSlice("filter") returns ["flag1", "flag2", "flag3"] as expected.
If I start my binary with --filter flag4, c.StringSlice("filter") returns ["flag1", "flag2", "flag3", "flag4"]. I find this behaviour odd, I expected it to erase the default value.
Even worst, if I start my binary with --filter flag1, c.StringSlice("filter") returns ["flag1", "flag2", "flag3", "flag1"].

Is this the expected behavior ? I know I have 3 default value so I can do c.StringSlice("filter")[3:] if set, but still it's not perfect.

[jszwedko]

Mmm this definitely feels unexpected to me.

[icexin]

EnvVar of StringSlice also has this behavior.

[huguesalary]

I also have this issue and also feels this behavior is completely unexpected. Is there any plans on fixing this?

I'll see if I can take a stab at it and do a PR too.

[jszwedko]

I'd be happy to review a PR for this @huguesalary !

[jinhao]

I also hava this issue, expect to change this behavior.