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Previously a purge_store was only purging caches but it was leaving a reference to the store instance for the cache definition. As a result, the cache was never cleared away correctly and, in cases where the cache store makes a TCP connection to a backend system, the number of open sockets was increasing for each store instance. After a complete purge, as found in the unit test reset, the cache definitions should be both purged and removed. This change should also lead to a drop in memory consumption for unit tests as there will no longer be references to unused definition stores.