Downgrade code

src/WordPress/Blueprints/Cache/FileCache.php

@@ -2,14 +2,20 @@
 
 namespace WordPress\Blueprints\Cache;
 
+use iterable;
 use Psr\SimpleCache\CacheInterface;
 use Symfony\Component\Filesystem\Filesystem;
 use Symfony\Component\Filesystem\Exception\IOExceptionInterface;
 
 class FileCache implements CacheInterface {
 	private $filesystem;
+	/**
+	 * @var string|null
+	 */
+	private $cacheDirectory;
 
-	public function __construct( private string|null $cacheDirectory = null ) {
+	public function __construct( $cacheDirectory = null ) {
+		$this->cacheDirectory = $cacheDirectory;
 		// initialize the Filesystem component
 		$this->filesystem = new Filesystem();
 
@@ -34,7 +40,7 @@ public function __construct( private string|null $cacheDirectory = null ) {
 		}
 	}
 
-	public function get( $key, $default = null ): mixed {
+	public function get( $key, $default = null ) {
 		$filepath = $this->getFilePathForKey( $key );
 		if ( ! file_exists( $filepath ) ) {
 			return $default;