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Many firms have absolutely gargantuan spreadsheets and workbooks.

I suspect that individual files would become humongous with those features added.

If you store the commands from the beginning, you can recreate the state at any point in time.

Space gets cheaper every day.

The idea does have merit. On the average case it should be able to work.

A few things may be an issue with implementation, one of which would be excel macros. As it stands excel undo cannot regress past the last use of a macro. I suspect a state list may encounter a similar roadblock.

As it stands excel can be very very slow on large sets of data. On a sufficiently complex and clean model, I've seen load times and computer slow downs which begin to make Tokyo traffic seem mild, if it doesn't just hang.

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