Enable migrators to use previous version of an document.
This would be useful in implementations where users can request downgraded versions of a document where the downgrade results in loss of data, that data can then be restored as the document comes back in by use of the previous version.
Enable migrators to use previous version of an document.
This would be useful in implementations where users can request downgraded versions of a document where the downgrade results in loss of data, that data can then be restored as the document comes back in by use of the previous version.