Fix defaultIsZeroValue check for generic Value type

MidnightRocket · MidnightRocket · commit 9edfc8d416be · 2025-03-18T15:17:18.000+01:00
diff --git a/flag.go b/flag.go
@@ -551,7 +551,7 @@ func (f *Flag) defaultIsZeroValue() bool {
 	case *intSliceValue, *stringSliceValue, *stringArrayValue:
 		return f.DefValue == "[]"
 	default:
-		switch f.Value.String() {
+		switch f.DefValue {
 		case "false":
 			return true
 		case "<nil>":
