diff --git a/core/lib/Drupal/Core/ParamConverter/ParamConverterManager.php b/core/lib/Drupal/Core/ParamConverter/ParamConverterManager.php
index 8021568..cad587b 100644
--- a/core/lib/Drupal/Core/ParamConverter/ParamConverterManager.php
+++ b/core/lib/Drupal/Core/ParamConverter/ParamConverterManager.php
@@ -156,8 +156,9 @@ public function enhance(array $defaults, Request $request) {
     // variables in the route path pattern.
     $route = $defaults[RouteObjectInterface::ROUTE_OBJECT];
     $variables = array_flip($route->compile()->getVariables());
-    // Because foreach copies the values from the array it iterates even if they
-    // are references, use it to break references.
+    // Foreach  will copy the values from the array it iterates. Even if they
+    // are references, use it to break them. This avoids any scenarios where raw
+    // variables also get replaced with converted values.
     $raw_variables = array();
     foreach (array_intersect_key($defaults, $variables) as $key => $value) {
       $raw_variables[$key] = $value;