https://bugzilla.wikimedia.org/show_bug.cgi?id=59941

Matthias Mullie <[email protected]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|Low                         |Unprioritized
             Status|PATCH_TO_REVIEW             |NEW
                 CC|                            |[email protected]

--- Comment #3 from Matthias Mullie <[email protected]> ---
This was quite a nasty bug, that could only occur in a couple of caches (that
have no native CAS)

Bottom line: for caches with non-native CAS, CAS tokens (to confirm if data in
cache can reliably be merged without concurrency) are based on the value
stored.
When saving, this token is compared with what's currently in cache.

Since it was based on an object, the cache data was actually the same, but was
in 2 objects, which did not ===

More details in commit msg of https://gerrit.wikimedia.org/r/107348

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