Connection::setAutoCommit() will return void

lib/Doctrine/DBAL/Connection.php

@@ -503,12 +503,11 @@ class Connection implements DriverConnection
      *
      * @see   isAutoCommit
      *
-     * @param bool $autoCommit True to enable auto-commit mode; false to disable it.
+     * @throws ConnectionException
+     * @throws DriverException
      */
-    public function setAutoCommit($autoCommit)
+    public function setAutoCommit(bool $autoCommit) : void
     {
-        $autoCommit = (bool) $autoCommit;
-
         // Mode not changed, no-op.
         if ($autoCommit === $this->autoCommit) {
             return;

tests/Doctrine/Tests/DBAL/ConnectionTest.php

@@ -251,8 +251,6 @@ class ConnectionTest extends DbalTestCase
     {
         $this->connection->setAutoCommit(false);
         self::assertFalse($this->connection->isAutoCommit());
-        $this->connection->setAutoCommit(0);
-        self::assertFalse($this->connection->isAutoCommit());
     }
 
     /**