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.. change::
:tags: feature, region
:tickets: 236
Added new construct :class:`.api.CantDeserializeException` which can be
raised by user-defined deserializer functions which would be passed to
:paramref:`.CacheRegion.deserializer`, to indicate a cache value that can't
be deserialized and therefore should be regenerated. This can allow an
application that's been updated to gracefully re-cache old items that were
persisted from a previous version of the application. Pull request courtesy
Simon Hewitt.
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