Provides a Ceylonic [[EntityManager]] for use with the Java Persistence API. An `EntityManager` may be instantiated directly, given an instance of [[javax.persistence.EntityManager|javax.persistence::EntityManager]]. value emf = Persistence.createEntityManagerFactory("example"); value em = EntityManger(emf.createEntityManager()); The `EntityManager` provides all the same operations as `javax.persistence.EntityManager`, but: 1. is slightly more typesafe, and 2. accepts [[Integer]], ...