Because a Person is not nessecarily a User, the compiler is not able to implicitly convert a Person to a User. In your particular case, since you know you have a list of Users, you can explicitly tell it, “I know this Person is actually a User” with the following:
if (person != null) return (User) person;
The cast ((User)) will throw an exception at runtime if the instance is not actually a User, but since you’ve started with a collection of Users to begin with, you don’t need to worry.
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