fix default condition

dara/core.go

@@ -642,8 +642,23 @@ func isNil(a interface{}) bool {
 	return vi.IsNil()
 }
 
+func isNilOrZero(value interface{}) bool {
+	if value == nil {
+		return true
+	}
+
+	v := reflect.ValueOf(value)
+	switch v.Kind() {
+	case reflect.Chan, reflect.Func, reflect.Map, reflect.Ptr, reflect.Interface, reflect.Slice:
+		return v.IsNil()
+	default:
+		// Check for zero value
+		return reflect.DeepEqual(value, reflect.Zero(v.Type()).Interface())
+	}
+}
+
 func Default(inputValue interface{}, defaultValue interface{}) (_result interface{}) {
-	if IsNil(inputValue) {
+	if isNilOrZero(inputValue) {
 		_result = defaultValue
 		return _result
 	}

dara/core_test.go

@@ -995,6 +995,33 @@ func Test_Default(t *testing.T) {
 
 	b := ToInt32(a)
 	utils.AssertEqual(t, Int32Value(b), int32(10))
+
+	// Testing Default with nil values
+	if result := Default(nil, "default"); result != "default" {
+		t.Errorf("expected 'default', got '%v'", result)
+	}
+
+	// Testing Default with zero values
+	if result := Default("", "default"); result != "default" {
+		t.Errorf("expected 'default', got '%v'", result)
+	}
+
+	if result := Default(0, 42); result != 42 {
+		t.Errorf("expected 42, got %v", result)
+	}
+
+	if result := Default(false, true); result != true {
+		t.Errorf("expected true, got %v", result)
+	}
+
+	// Testing Default with non-zero values
+	if result := Default("value", "default"); result != "value" {
+		t.Errorf("expected 'value', got '%v'", result)
+	}
+
+	if result := Default([]int{1, 2, 3}, []int{}); !reflect.DeepEqual(result, []int{1, 2, 3}) {
+		t.Errorf("expected [1 2 3], got '%v'", result)
+	}
 }
 
 func TestToBytes(t *testing.T) {