Deprecated: Method "JsonSerializable::jsonSerialize()"
Summary
Deprecated: Method "JsonSerializable::jsonSerialize()" might add "mixed" as a native return type declaration in the future.
Steps to reproduce
What is the current bug behavior?
What is the expected correct behavior?
Relevant error messages and/or screenshots
Possible fixes
Do the same in implementation "OpenApi\Annotations\AbstractAnnotation" now to avoid errors or add an explicit @return annotation to suppress this message.