Fix issue where non set optional values were transformed

src/Transformers/DataTransformer.php

@@ -76,6 +76,10 @@ protected function resolvePayload(TransformableData $data): array
 
             $name = $property->name;
 
+            if ($property->type->isOptional && ! isset($data->{$name})) {
+                continue;
+            }
+
             if (! $this->shouldIncludeProperty($name, $data->{$name}, $trees)) {
                 continue;
             }
@@ -234,7 +238,7 @@ protected function resolvePropertyValue(
         };
 
         if ($value instanceof TransformableData && $this->transformValues) {
-            return $value->transform($this->transformValues, $wrapExecutionType, $this->mapPropertyNames, );
+            return $value->transform($this->transformValues, $wrapExecutionType, $this->mapPropertyNames,);
         }
 
         return $value;

tests/ValidationTest.php

@@ -12,10 +12,6 @@
 use Illuminate\Validation\Rules\In as LaravelIn;
 use Illuminate\Validation\ValidationException;
 use Illuminate\Validation\Validator;
-
-use function Pest\Laravel\mock;
-use function PHPUnit\Framework\assertFalse;
-
 use Spatie\LaravelData\Attributes\DataCollectionOf;
 use Spatie\LaravelData\Attributes\MapInputName;
 use Spatie\LaravelData\Attributes\MapName;
@@ -69,6 +65,8 @@
 use Spatie\LaravelData\Tests\Fakes\Support\FakeInjectable;
 use Spatie\LaravelData\Tests\Fakes\ValidationAttributes\PassThroughCustomValidationAttribute;
 use Spatie\LaravelData\Tests\TestSupport\DataValidationAsserter;
+use function Pest\Laravel\mock;
+use function PHPUnit\Framework\assertFalse;
 
 it('can validate a string', function () {
     $dataClass = new class () extends Data {
@@ -2379,3 +2377,13 @@ public static function rules(ValidationContext $context): array
         ->assertOk(['success' => true, 'id' => 1])
         ->assertErrors(['success' => true]);
 })->skip('V4: The rule inferrers need to be rewritten/removed for this, we need to first add attribute rules and then decide require stuff');
+
+it('will not transform non set optional properties ', function () {
+    $dataClass = new  class extends Data {
+        public array|Optional $optional;
+    };
+
+    expect($dataClass::from([])->toArray())->toBeEmpty();
+    expect($dataClass::from()->toArray())->toBeEmpty();
+    expect((new ($dataClass::class))->toArray())->toBeEmpty();
+});