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Changes between Initial Version and Version 1 of Ticket #9870, comment 6

initial	v1
4	4	I haven't done any performance measurements yet, but I can't imagine a string comparison being as fast as an integer comparison, neither in Python code, nor in the database.
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	6	And the cache is all about speed, so I'd be ready to sacrifice a bit of clarity for speed. We do lack unit tests for the cache subsystem, so this should be improved as well.
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6	8	> Right, I supposed we could somehow get easily a list of all the keys. But as it's not the case, then I think the trade-off between the proposed optimization and the loss of clarity is not in favor of the change.
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