NSPersistentHistoryChange value changed

I am trying to know the value that was changed in the history, however after getting the transaction,


after getting the NSPersistentHistoryChange


from the transaction.changes SET


the changes only give us a SET of updated properties, you don't know from which the old & new value in that time ...


you only have the changed object id and that will give you the current value ...


if you have 2 transactions that change the same entity, same field


it's impossible to know what was the value of the field in transaction 1


please help, that looks like a big omission


thanks

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