MF_INCLNULL
map->map_mflags = MF_INCLNULL;
map->map_mflags |= MF_INCLNULL;
if (bitset(MF_INCLNULL, map->map_mflags))
map->map_mflags |= MF_INCLNULL;
inclnull = bitset(MF_INCLNULL, map->map_mflags);
map->map_mflags &= ~MF_INCLNULL;
map->map_mflags |= MF_INCLNULL;
if (bitset(MF_INCLNULL, map->map_mflags))
map->map_mflags |= MF_INCLNULL;
map->map_mflags |= MF_INCLNULL;