[RSS Feed/News] Deprecated: Return type of XF\App::offsetExists($key) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool

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I'm using PHP 8.1.0
Code:

Deprecated: Return type of XF\App::offsetExists($key) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /Users/zix/Documents/www/xf2/src/XF/App.php on line 2398

Fatal error: During inheritance of ArrayAccess: Uncaught ErrorException: [E_DEPRECATED] Return type of XF\DataRegistry::offsetExists($key) should either be compatible with...

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