docs: static Class<?> getKeyTypeFromEnumMap(Object enumMap)
      {
          if (__keyTypeFromEnumMap == null)
          {
              throw new RuntimeException(
                      "Could not access (reflection) the private "
                              + "field *keyType* (enumClass) from: class java.util.EnumMap");
          }
  
          try
          {
              return (Class<?>) __keyTypeFromEnumMap.get(enumMap);
          }
          catch (Exception e)
          {
              throw new RuntimeException(e);
          }
      }