luabind - problem with luabind::object reference

Using C++, lua5.1, luabind 0.7

*** Lua code: ***
-- allocates near 8Mb of memory
function fff()
    local t = {}
    for i = 1, 300000 do
        table.insert(t, i)
    end
    return t
end

*** C++ code ***
{
    luaL_dostring(lua_state, "return fff()");
    luabind::object obj(luabind::from_stack(ls, -1));
}
lua_gc(l_, LUA_GCCOLLECT, 0); // collect garbage

Result: Lua still have a 8Mb allocated memory. Garbage collection ignores
that table object. It has references anywhere? But where? That table
deallocates only on program exit (when "lua_close" function called). How to
solve this problem and what is the reason?

Thank you.

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