It should be read or edited using a copy of Mathematica or MathReader. The line below identifies what version of Mathematica created this file, but it can be opened using any other version as well. This module defines or updates an individual node in the Master Node Definition Table. If the exterior node number matches one already in the MNDT, the old nNL is replaced. This code is usually inlined in modules that need this array.
Lists can contain objects of different type, including lists.
Array items must be of the same type and occupy the same storage space. Lists are highly dynamic, being able to growth and shrink during execution. No explicit solution needed.