Should be compatible with ArrayAccess::offset

[Dreller]

I got this message when I use the Class:

<br/>
<b>Deprecated</b>
:  Return type of MareiCollection::offsetExists($offset) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in <b>C:\laragon\www\operations\php\MareiDB-1.0\db.php</b>
on line <b>820</b>
<br/>
<br/>
<b>Deprecated</b>
:  Return type of MareiCollection::offsetGet($offset) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in <b>C:\laragon\www\operations\php\MareiDB-1.0\db.php</b>
on line <b>828</b>
<br/>
<br/>
<b>Deprecated</b>
:  Return type of MareiCollection::offsetSet($offset, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in <b>C:\laragon\www\operations\php\MareiDB-1.0\db.php</b>
on line <b>781</b>
<br/>
<br/>
<b>Deprecated</b>
:  Return type of MareiCollection::offsetUnset($offset) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in <b>C:\laragon\www\operations\php\MareiDB-1.0\db.php</b>
on line <b>824</b>

[yan-imaev]

I have the same problem, how did you solve it? How to reach developers to give comments?