Some commands accepting multiple keys can be hashed if all the keys return the same hash (key tags).

List of the commands affected by this change (based on Redis 2.2):
    MSET, MGET, DEL, BLPOP, BRPOP, RPOPLPUSH, BRPOPLPUSH, SINTER, SINTERSTORE,
    SUNION, SUNIONSTORE, SDIFF, SDIFFSTORE, ZINTERSTORE, ZUNIONSTORE.

lib/Predis/Commands/SetIntersectionStore.php

@@ -5,7 +5,9 @@ namespace Predis\Commands;
 use Predis\Utils;
 
 class SetIntersectionStore extends Command {
-    protected function canBeHashed() { return false; }
+    protected function canBeHashed() {
+        return $this->checkSameHashForKeys($this->getArguments());
+    }
     public function getId() { return 'SINTERSTORE'; }
     public function filterArguments(Array $arguments) {
         return Utils::filterArrayArguments($arguments);