GroupValue(Bool("b", true), Int("i", 4)),
		GroupValue(Bool("b", true), Int("j", 4)),
		DurationValue(3 * time.Second),
		DurationValue(2 * time.Second),
		StringValue("foo"),
		StringValue("fuu"),
	}
	for i, v1 := range vals {
		for j, v2 := range vals {
			got := v1.Equal(v2)
			want := i == j
			if got != want {
				t.Errorf("%v.Equal(%v): got %t, want %t", v1, v2, got, want)
			}
		}
	}
}