docs: private static List<ClassNode> keepLowestCommonInterfaces(List<ClassNode> fromA, List<ClassNode> fromB) {
          if (fromA==null||fromB==null) return EMPTY_CLASSNODE_LIST;
          Set<ClassNode> common = new HashSet<ClassNode>(fromA);
          common.retainAll(fromB);
          List<ClassNode> result = new ArrayList<ClassNode>(common.size());
          for (ClassNode classNode : common) {
              addMostSpecificInterface(classNode, result);
          }
          return result;
      }