[#2570593]: Add @todo and @see about removing EntityStorageBase::entityClass BC layers in D10.

core/lib/Drupal/Core/Entity/EntityStorageBase.php

@@ -68,6 +68,9 @@ abstract class EntityStorageBase extends EntityHandlerBase implements EntityStor
    * entity type, via hook_entity_bundle_info() or via
    * hook_entity_bundle_info_alter().
    *
+   * @todo Remove this in Drupal 10.
+   * @see https://www.drupal.org/project/drupal/issues/3244802
+   *
    * @var string|null
    */
   private $baseEntityClass;
@@ -108,6 +111,8 @@ public function __construct(EntityTypeInterface $entity_type, MemoryCacheInterfa
    * {@inheritdoc}
    */
   public function getEntityClass(?string $bundle = NULL): string {
+    // @todo Simplify this in Drupal 10 to return $this->entityType->getClass().
+    // @see https://www.drupal.org/project/drupal/issues/3244802
     return $this->baseEntityClass ?? $this->entityType->getClass();
   }
 
@@ -116,6 +121,9 @@ public function getEntityClass(?string $bundle = NULL): string {
    *
    * @param string $name
    *   The name of the property to get.
+   *
+   * @todo Remove this in Drupal 10.
+   * @see https://www.drupal.org/project/drupal/issues/3244802
    */
   public function __get($name) {
     if ($name === 'entityClass') {
@@ -131,6 +139,9 @@ public function __get($name) {
    *   The name of the property to set.
    * @param mixed $value
    *   The value to use.
+   *
+   * @todo Remove this in Drupal 10.
+   * @see https://www.drupal.org/project/drupal/issues/3244802
    */
   public function __set(string $name, $value): void {
     if ($name === 'entityClass') {