minetest.register_on_generated(function(minp, maxp, seed)
        local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
        local area = VoxelArea:new{MinEdge=emin, MaxEdge=emax}
        local data = vm:get_data()

        vm:set_data(data)
        --vm:set_lighting({day=0, night=0})
        --vm:calc_lighting()
        vm:write_to_map(data)

end)



...........

==5210== LEAK SUMMARY:
==5210==    definitely lost: 336 bytes in 7 blocks
==5210==    indirectly lost: 115,360 bytes in 2,401 blocks
==5210==      possibly lost: 64 bytes in 1 blocks
==5210==    still reachable: 24,448 bytes in 415 blocks
==5210==         suppressed: 0 bytes in 0 blocks