Comment by mrgoldenbrown
5 hours ago
That headline would be inaccurate. Persistent undo is different than cache. Cache implies a temporary copy of data whose actual existence is elsewhere. Persistent undo is advertised as persistent, not as temporary.
In practice the feature is as persistent as your last git checkout. There are countless events (including git checkouts, vim recoveries) that simply reset the status of the "persistent" undo. Use a real VCS if you treasure your history as this is just a best effort feature.