fix magnetCommentIdParent data type as mixed

src/crontab/export/feed.php

@@ -413,7 +413,7 @@ try
           $magnetComments[] = (object)
           [
             'magnetCommentId'       => (int) $magnetComment->magnetCommentId,
-            'magnetCommentIdParent' => (int) $magnetComment->magnetCommentIdParent,
+            'magnetCommentIdParent' => $magnetComment->magnetCommentIdParent,
             'userId'                => (int) $magnetComment->userId,
             'magnetId'              => (int) $magnetComment->magnetId,
             'timeAdded'             => (int) $magnetComment->timeAdded,

src/library/valid.php

@@ -995,7 +995,7 @@ class Valid
 
   public static function magnetCommentIdParent(mixed $value, array &$error = []) : bool
   {
-    if (!(is_bool($value) || is_int($value)))
+    if (!(is_null($value) || is_int($value)))
     {
       array_push(
         $error,