Fix error when use numeric for reference name #517
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Fix #512
The method ReferenceRepository::setReferenceIdentity(string $name, mixed $identity, string $class): void typed the parameter $name with string and numeric reference names is cast to integers when are recovered from ReferenceRepository::getReferenceNames($object) method in previous lines, so when pass the value of numeric name in integer with a parameter typed with string then fails.
So I propose a fix to cast names to string in ReferenceRepository::getReferenceNames($object) when are returned