item grid persistence and identification

[Adil]

Many objects provide links to the objects higher in hierarchy (entity - force\surface, gui - parent element). Can we have grid point to the owner entity or item? Can we have item_stack class point to inventory? Can we have inventory point to entity?

Secondly, aka item with unit number

edit: I've just realized that I've already posted conceptually similar request a while ago. The idea is that things can happen to item grids while they're in different states and they do change states often, but there's no way for a mod to tell that it has seem the grid before.

I the reference to grid becomes invalid when armor item is moved around or entity is mined, however, I've noticed that data on equipment configuration and even energy is retained throughout these transitions.
Could we have a unique identifier (like unit_number) included in such persistent data?

[Rseding91]

An equipment grid has no reference to what owns it. The Lua object points directly at it.

As for inventory: it may or have an associated entity, item, or none.