diff -u b/core/lib/Drupal/Core/Cache/Cache.php b/core/lib/Drupal/Core/Cache/Cache.php
--- b/core/lib/Drupal/Core/Cache/Cache.php
+++ b/core/lib/Drupal/Core/Cache/Cache.php
@@ -24,8 +24,10 @@
   /**
    * Merges arrays of cache contexts and removes duplicates.
    *
-   * @param string[] …
-   *   Arrays of cache contexts to merge.
+   * @param array $a
+   *    Cache context array to merge.
+   * @param array $b
+   *    Cache context array to merge.
    *
    * @return string[]
    *   The merged array of cache contexts.
@@ -48,8 +50,10 @@
    * allows items to be invalidated based on all tags attached to the content
    * they're constituted from.
    *
-   * @param string[] …
-   *   Arrays of cache tags to merge.
+   * @param array $a
+   *    Cache tag array to merge.
+   * @param array $b
+   *    Cache tag array to merge.
    *
    * @return string[]
    *   The merged array of cache tags.
@@ -66,8 +70,10 @@
    *
    * Ensures infinite max-age (Cache::PERMANENT) is taken into account.
    *
-   * @param int …
-   *   Max-age values.
+   * @param int $a
+   *    Max age value to find.
+   * @param int $b
+   *    Max age value to find..
    *
    * @return int
    *   The minimum max-age value.