Update jsonSerialize for PHP 8.1 #265
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The original `jsonSerialize` method signature has changed to `public function jsonSerialize(): mixed;`. This works under PHP 8.1, but to support older PHP versions too, this PR adds the optional `ReturnTypeWillChange` attribute.
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The original jsonSerialize method signature has changed to public function jsonSerialize(): mixed;. This works under PHP 8.1, but to support older PHP versions too, this PR adds the optional ReturnTypeWillChange attribute.