* Merges arrays of cache contexts and removes duplicates.
*
* @param array $a
- * Cache contexts array to merge.
+ * Cache contexts array to merge.
* @param array $b
- * Cache contexts array to merge.
+ * Cache contexts array to merge.
*
* @return string[]
* The merged array of cache contexts.
* they're constituted from.
*
* @param array $a
- * Cache tags array to merge.
+ * Cache tags array to merge.
* @param array $b
- * Cache tags array to merge.
+ * Cache tags array to merge.
*
* @return string[]
* The merged array of cache tags.
* Ensures infinite max-age (Cache::PERMANENT) is taken into account.
*
* @param int $a
- * Max age value to merge.
+ * Max age value to merge.
* @param int $b
- * Max age value to merge.
+ * Max age value to merge.
*
* @return int
* The minimum max-age value.