The expression return array($binaryOptions, $validatorChain) returns the type array<integer,Zend\Valid...datorChain|array|mixed> which is incompatible with the return type mandated by Zend\ServiceManager\Fact...ryInterface::__invoke() of object.
In the issue above, the returned value is violating the contract defined by the
mentioned interface.
Let's take a look at an example:
interfaceHasName{/** @return string */publicfunctiongetName();}className{public$name;}classUserimplementsHasName{/** @return string|Name */publicfunctiongetName(){returnnewName('foo');// This is a violation of the ``HasName`` interface// which only allows a string value to be returned.}}
In the issue above, the returned value is violating the contract defined by the mentioned interface.
Let's take a look at an example: