docs: public Flowable<Collection<Transformed>> all() {
      return baseQuery()
          .all()
          .map(
              new Function<CDAArray, Collection<Transformed>>() {
                @Override
                public Collection<Transformed> apply(CDAArray array) {
                  final ArrayList<Transformed> result = new ArrayList<>(array.total());
  
                  for (final CDAResource resource : array.items) {
                    if (resource instanceof CDAEntry
                        && ((CDAEntry) resource).contentType().id().equals(contentTypeId)) {
                      result.add(TransformQuery.this.transform((CDAEntry) resource));
                    }
                  }
                  return result;
                }
              }
          );
    }