Method signatures of save(…) methods in CrudRepository now return the concrete type passed in. This way subtypes can be persisted without casting the result back.
class Contact { … }
class Person extends Contact { … }
interface ContactRepository extends CrudRepository<Contact, Long> { … }
Before:
Person person = new Person();
person = (Person) repo.save(person);
^^^^^^^^
Now:
Person person = new Person();
person = repo.save(person);
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