docs: protected ExpandDataTrunk getExpansion(final String expansionName, final Map<String, Collection<String>> subExpansionNames) {
          final ExpandDataTrunk expandData = new ExpandDataTrunk(new ExpandDataDetails(expansionName));
          // Add the sub expansions
          expandData.setBranches(getExpansionBranches(subExpansionNames));
          return expandData;
      }