Just a bit of proofreading ..
> - _cache is a PickeCache, a cache which can ghostify objects not
> - _added is a dict of oid->obj added explicitely through add().
> _added is used as a sort of preliminary cache until commit time
is used as a preliminary cache
> where objects are all moved to the real _cache. The object are
> either added by add() or implicitely added (discovered by the
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