- public function merge( $key, $callback, $exptime = 0, $attempts = 10 ) {
- return $this->writeStore->merge( $key, $callback, $exptime, $attempts );
+ public function merge( $key, callable $callback, $exptime = 0, $attempts = 10, $flags = 0 ) {
+ return $this->writeStore->merge( $key, $callback, $exptime, $attempts, $flags );