code: public static <T> Observable<T> repeating(final T t) {
          return Observable.unsafeCreate(new OnSubscribeRepeating<T>(t));
      }
docs: Returns an Observable that epeats emitting {@code t} without completing.
  Supports backpressure.
  
  @param t
  value to repeat
  @param <T>
  type of t
  
  @return an observable that repeats t forever (or until unsubscribed)