docs: public <T> List<Key<T>> getKeysByManualRefs(final Class<T> clazz, final List<Object> refs) {
          final String collection = getCollectionName(clazz);
          final List<Key<T>> keys = new ArrayList<Key<T>>(refs.size());
          for (final Object ref : refs) {
              keys.add(this.<T>manualRefToKey(collection, ref));
          }
  
          return keys;
      }