check for ArrayAccess instead of ArrayObject

src/JsonMapper.php

@@ -269,7 +269,7 @@ public function map($json, $object)
                     $array = $this->createInstance($proptype, false, $jvalue);
                 }
             } else {
-                if (is_a($type, 'ArrayObject', true)) {
+                if (is_a($type, 'ArrayAccess', true)) {
                     $array = $this->createInstance($type, false, $jvalue);
                 }
             }

tests/ArrayTest.php

@@ -14,6 +14,7 @@
 use namespacetest\model\MyArrayObject;
 
 require_once 'JsonMapperTest/Array.php';
+require_once 'JsonMapperTest/ArrayAccessCollection.php';
 require_once 'JsonMapperTest/Broken.php';
 require_once 'JsonMapperTest/Simple.php';
 require_once 'JsonMapperTest/Zoo/Animal.php';
@@ -221,6 +222,22 @@ public function testMapSimpleArrayObject()
         $this->assertEquals(1, $sn->pSimpleArrayObject['zwei']);
     }
 
+    public function testMapSimpleArrayAccess()
+    {
+        $jm = new JsonMapper();
+        $sn = $jm->map(
+            json_decode(
+                '{"pArrayAccessCollection":{"eins": 1,"zwei": "two"}}'
+            ),
+            new JsonMapperTest_Array()
+        );
+        $this->assertInstanceOf('ArrayAccess', $sn->pArrayAccessCollection);
+        $this->assertIsInt($sn->pArrayAccessCollection['eins']);
+        $this->assertIsString($sn->pArrayAccessCollection['zwei']);
+        $this->assertEquals(1, $sn->pArrayAccessCollection['eins']);
+        $this->assertEquals("two", $sn->pArrayAccessCollection['zwei']);
+    }
+
     public function testInvalidArray()
     {
         $this->expectException(JsonMapper_Exception::class);

tests/JsonMapperTest/Array.php

@@ -81,6 +81,11 @@ class JsonMapperTest_Array
      */
     public $pArrayObjectList;
 
+    /**
+     * @var ArrayAccessCollection
+     */
+    public $pArrayAccessCollection;
+
     /**
      * Array of ArrayObject instances
      * @var \namespacetest\model\MyArrayObject[]

tests/JsonMapperTest/ArrayAccessCollection.php

@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+class ArrayAccessCollection implements \ArrayAccess
+{
+    /**
+     * @var array
+     */
+    private $data;
+
+    #[\ReturnTypeWillChange]
+    public function offsetExists($offset)
+    {
+        return isset($this->data[$offset]);
+    }
+
+    #[\ReturnTypeWillChange]
+    public function offsetGet($offset)
+    {
+        return $this->data[$offset] ?? null;
+    }
+
+    #[\ReturnTypeWillChange]
+    public function offsetSet($offset, $value)
+    {
+        $this->data[$offset] = $value;
+    }
+
+    #[\ReturnTypeWillChange]
+    public function offsetUnset($offset)
+    {
+        unset($this->data[$offset]);
+    }
+}