@@ -155,7 +155,7 @@ class Connection extends EventEmitter
155155 private $ tlsConnectorFlags = [];
156156 private $ password ;
157157
158- public function __construct (array $ parameters , LoopInterface $ loop , ConnectorInterface $ connector = null )
158+ public function __construct (array $ parameters , LoopInterface $ loop , ? ConnectorInterface $ connector = null )
159159 {
160160 if (!is_array ($ parameters ) ||
161161 !isset ($ parameters ['user ' ]) ||
@@ -572,7 +572,7 @@ private function handleRowDescription(RowDescription $message)
572572 $ this ->addColumns ($ message ->getColumns ());
573573 }
574574
575- private function failAllCommandsWith (\Throwable $ e = null )
575+ private function failAllCommandsWith (? \Throwable $ e = null )
576576 {
577577 $ e = $ e ?: new \Exception ('unknown error ' );
578578
@@ -642,7 +642,7 @@ public function processQueue()
642642 public function query ($ query ): Observable
643643 {
644644 return new AnonymousObservable (
645- function (ObserverInterface $ observer , SchedulerInterface $ scheduler = null ) use ($ query ) {
645+ function (ObserverInterface $ observer , ? SchedulerInterface $ scheduler = null ) use ($ query ) {
646646 if ($ this ->connStatus === $ this ::CONNECTION_NEEDED ) {
647647 $ this ->start ();
648648 }
@@ -692,7 +692,7 @@ public function executeStatement(string $queryString, array $parameters = []): O
692692 */
693693
694694 return new AnonymousObservable (
695- function (ObserverInterface $ observer , SchedulerInterface $ scheduler = null ) use ($ queryString , $ parameters ) {
695+ function (ObserverInterface $ observer , ? SchedulerInterface $ scheduler = null ) use ($ queryString , $ parameters ) {
696696 if ($ this ->connStatus === $ this ::CONNECTION_NEEDED ) {
697697 $ this ->start ();
698698 }
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