[ZODB-Dev] undo and zodb

[Mario Bianchi]

Hi everybody,
are here any ZODB back-end storages (e.g. FileStorage) available that don't 
support undo (let's call it nonundoable)?
Or maybe I didn't get it and it's the ZODB itself that supports undo, no 
matter what
back-end storage of choice?
In the latter case, I guess there's no way of storing write-intensive data 
(say session data) to a ZODB without wasting lots of space, isn't it?

Thanks in advance. Cheers,
Mario

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