The expression return (int)$data returns the type integer which is incompatible with the return type mandated by Symfony\Component\Serial...nterface::denormalize() of object.
In the issue above, the returned value is violating the contract defined by the
mentioned interface.
Let's take a look at an example:
interfaceHasName{/** @return string */publicfunctiongetName();}className{public$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.}}
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}
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/**
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* {@inheritdoc}
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*/
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public function supportsDenormalization($data, $type, $format = null): bool
In the issue above, the returned value is violating the contract defined by the mentioned interface.
Let's take a look at an example: