diff --git a/core/lib/Drupal/Core/Render/Element/Radio.php b/core/lib/Drupal/Core/Render/Element/Radio.php
index 5a115fb..f10fc4d 100644
--- a/core/lib/Drupal/Core/Render/Element/Radio.php
+++ b/core/lib/Drupal/Core/Render/Element/Radio.php
@@ -38,9 +38,10 @@ public function getInfo() {
   }
 
  /**
-  * Helper function to cast bool values to string.
+  * Ensures $element['#default_value'] and $element['#value'] are consistently
+  * typed.
   *
-  * @param bool $value
+  * @param mixed $value
   *   A bool value which would be casted to string.
   *
   * @return string