code: public Map<Any2<Integer, String>, String> getStringMap() {
          return data.entrySet().stream()
                  .collect(Collectors.toMap(Map.Entry::getKey, entry -> entry.getValue().mapCombine(Object::toString, Object::toString, Object::toString)));
      }
docs: Get the underlying map, but with all values converted to string.
  
  @return The raw map with every value converted to a string.