Return type of ArrayAccess::offsetGet is incorrect

[ntm-dev]

My current php setted to 7.4:

Error Declaration of ArrayIterator::offsetGet($key) must be compatible with ArrayAccess::offsetGet(mixed $offset): mixed has been displayed:

But the mixed type available as of PHP 8.0.0

see PHP: Type declarations

[jakubmisek]

Thank you! Upcomning update fixes the falsy warning in PHP <= 8.1.