docs: Note of hidden properties

tests/system/Entity/EntityTest.php

@@ -46,7 +46,7 @@ public function testSetStringToPropertyNamedAttributes(): void
     }
 
     /**
-     * @see https://github.com/codeigniter4/CodeIgniter4/issues
+     * @see https://github.com/codeigniter4/CodeIgniter4/issues/5762
      */
     public function testSetArrayToPropertyNamedAttributes(): void
     {

user_guide_src/source/models/entities.rst

@@ -40,7 +40,7 @@ Assume you have a database table named ``users`` that has the following schema::
     password    - string
     created_at  - datetime
 
-.. important:: ``attributes`` is a reserved word for internal use. If you use it as a column name, the Entity does not work correctly.
+.. important:: ``attributes`` is a reserved word for internal use. Prior to v4.4.0, if you use it as a column name, the Entity does not work correctly.
 
 Create the Entity Class
 =======================
@@ -118,6 +118,14 @@ Using the raw version will bypass magic "getter" methods and casts. Both methods
 to specify whether returned values should be filtered by those that have changed, and a boolean final parameter to
 make the method recursive, in case of nested Entities.
 
+Hidden properties
+=================
+
+It is possible to set properties that are only available in raw form. The property must start with an underscore. Casting cannot be applied to such fields.
+This is created so that we allow our magic methods a chance to do their thing, but you can use it in another way.
+
+.. literalinclude:: entities/028.php
+
 ***********************
 Handling Business Logic
 ***********************

user_guide_src/source/models/entities/028.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace App\Entities;
+
+use CodeIgniter\Entity\Entity;
+
+class User extends Entity
+{
+    protected $attributes = [
+        '__secure' => 'On',
+        'about'    => '',
+    ];
+}
+
+$user = new User(['__secure' => 'Off', 'about' => 'Hi, I am John!']);
+
+print_r($user->toArray());
+print_r($user->toRawArray());
+
+/**
+ * Output:
+ * (
+ *     [about] => Hi, I am John!
+ * )
+ * Array
+ * (
+ *     [__secure] => Off
+ *     [about]   => Hi, I am John!
+ * )
+ */