Fix implicit nullables

Author: tvdijen

src/MetaLoader.php

@@ -50,7 +50,7 @@ class MetaLoader
      * @param string|null  $stateFile
      * @param object|null  $oldMetadataSrc
      */
-    public function __construct(int $expire = null, string $stateFile = null, object $oldMetadataSrc = null)
+    public function __construct(?int $expire = null, ?string $stateFile = null, ?object $oldMetadataSrc = null)
     {
         $this->expire = $expire;
         $this->oldMetadataSrc = $oldMetadataSrc;
@@ -522,7 +522,7 @@ public function dumpMetadataStdOut(): void
      * @param string $type The metadata type.
      * @param array|null $template The template.
      */
-    private function addMetadata(string $filename, ?array $metadata, string $type, array $template = null): void
+    private function addMetadata(string $filename, ?array $metadata, string $type, ?array $template = null): void
     {
         if ($metadata === null) {
             return;

src/MetaRefresh.php

@@ -32,9 +32,9 @@ public function __construct(Configuration $config, Configuration $modconfig)
     }
 
     /**
-     * @param string $crontag Only refresh sets which allow this crontag
+     * @param string|null $crontag Only refresh sets which allow this crontag
      */
-    public function runRefresh(string $crontag = null): void
+    public function runRefresh(?string $crontag = null): void
     {
         $sets = $this->modconfig->getArray('sets');
         /** @var string $datadir */