Rails core - Aug 2013 - Feature Request - Add model_was and revert_changes to ActiveModel::Dirty

I''ve encountered a need to use the previous state of the model, before
all
the changes were made.

I fantasized about something like:
model.was
or 
model.before_changes

Also, a nice method to have is ''revert_changes'', that reverts
all the
changes (without reloading the model from DB).

Alternatively:
revert_changes would be the first method I suggested (reverting changes 
without changing the object), and:
revert_changes! would be the second one (reverting changes on the object 
itself).

I would like to make a pull request.

implementing the second one is easy - I just loop through changes and undo 
them.
First one is harder because we need another instance of the model, maybe 
I''ll use ''dup'' method?

ideas, thoughts?

Thanks

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