Casting the role property in the constructor is necessary tolet the equals function binary comparison work properly whileusing a custom role entity.The security identity retrieval strategy getSecurityIdentitiesfunction instantiates the role security identity class passing anobject. The constructor will assign this object to $this->role in case it's not an instance of Role. Binary safe comparison will fail even though gettype returns "string". The custom role entity requires a __toString magic method in this case.

The role security identity was only working when using the origin Role class. The construct method is changed to enable support for custom role entities.