aacdded178
The purpose of these changes is to verify that a situation is not occurring. Currently, a situation could theoretically arise where a lock expires for one thread, a new thread gets a new lock on the same key, and the old thread then completes. The out of order deletion of the lock would cause a cascade effect, and the lock would then be entirely ineffective for all threads until there is no contention on the lock anymore for the expiration period. Presently, if this situation occurs it does so silently since no error would be thrown.
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