public void DeallocateSystemData(uint systemId)
{
if (!UnsafeHashMap.ContainsKey(SystemData, systemId))
{
throw new InvalidOperationException();
}
UnsafeUtility.Free((void *)UnsafeHashMap.Get <uint, IntPtr>(SystemData, systemId), Allocator.Persistent);
UnsafeHashMap.Remove(SystemData, systemId);
}