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src/Service/Nelmio/DtoOADescriber.php

@@ -230,6 +230,7 @@ private function resolveProperties(
             ]);
 
             if (is_array($model)) {
+                // checking whether there is an empty index by which you can distinguish whether the model is a collection of objects or a flat object
                 if (is_array($model[''] ?? null)) {
                     $property->type = "array";
                     $property->items = new Items([]);
@@ -345,7 +346,7 @@ private function getClassBags(
             }
 
             if ($item instanceof DtoTypeModel) {
-                if ($item->isCollection()) {
+                if ($item->isCollection()) { // forces an empty index to make it easier to check whether an element is an array
                     $propertyPath .= '.';
                 }
                 $bags = DtoUtil::mergeRecursively($bags, $this->getClassBags($item, $propertyPath));

src/Service/Validation/TypeValidationHelper.php

@@ -42,6 +42,7 @@ public function validateType(
         }
 
         $list = new ConstraintViolationList();
+
         // coerce and copy sub-values
         foreach ($subValues as $key => $value) {
             if (null === ($result = $this->coercionService->coerce($key, $subProperties[$key], $value))) {