feat: 직접 작성한 DTO

src/sammo/DTO/Attr/JsonString.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace sammo\DTO\Attr;
+
+#[\Attribute(\Attribute::TARGET_PROPERTY)]
+class JsonString
+{
+  public function __construct(public readonly bool $emptyItemIsArray = false)
+  {
+  }
+}