V2 - index based methods should be turned into keys before creating actions out of them

[dxinteractive]

This is so when e.g. parcel.pop() or parcel.shift() are called on rebased data, the items being removed are done so by key and not by position in the array, or else unexpected items will disappear.

My data: [1,2,3]
I pop() and now have [1,2]
I rebase on top of someone elses changes (e.g. [1,2,3,4])

• current scenario is that after rebase I'll have [1,2,3], because 4 was popped off
• correct scenario is that after rebase I'll have [1,2,4], because I saw that the 3 was deleted as the result of the pop()