Create an interface for all "changing entities" events

Modules/Core/Contracts/EntityIsChanging.php

+<?php
+
+namespace Modules\Core\Contracts;
+
+interface EntityIsChanging
+{
+    /**
+     * Get the attributes used to create or modify an entity
+     * @return array
+     */
+    public function getAttributes();
+    /**
+     * Set the attributes used to create or modify an entity
+     * @param array $attributes
+     */
+    public function setAttributes(array $attributes);
+    /**
+     * Get the original attributes untouched by other listeners
+     * @return array
+     */
+    public function getOriginal();
+}

Modules/User/Events/UserIsCreating.php

@@ -2,7 +2,9 @@
 
 namespace Modules\User\Events;
 
-final class UserIsCreating
+use Modules\Core\Contracts\EntityIsChanging;
+
+final class UserIsCreating implements EntityIsChanging
 {
     /**
      * Contains the attributes which can be changed by other listeners

Modules/User/Events/UserIsUpdating.php

@@ -2,9 +2,10 @@
 
 namespace Modules\User\Events;
 
+use Modules\Core\Contracts\EntityIsChanging;
 use Modules\User\Entities\UserInterface;
 
-class UserIsUpdating
+final class UserIsUpdating implements EntityIsChanging
 {
     /**
      * @var UserInterface