list = (MergingList<T>) tgt;
        } else {
            list = new MergingList<>(computer, src.size() + tgt.size());
            list.mergeAll(tgt, new SourceDominant<T>(true));
        }

        list.mergeAll(src, remapping);
        return list;
    }

    /**
     * Merging list
     * @param <V>
     */