Subdocument access on array slices

Need support for get and mutatein for array index slices. For large objects if I need only a selected set of objects it becomes onerous to request individual entries in the array, would like to be able to do slices. 

e.g. 150 entries in the array, I need only [10..50] and  [100...120] from the array. I dont want to be making individual index calls it defeats the purpose.