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I've added two tests.
One ensures the current cache, redis and counter tests, are thread-safe (the counter test is actually not thread-safe, but the default hash values execute fast, so no failures are getting exposed).
The second exposes the non-thread-safe counter.
You could argue the second test is not needed. It's not the fault of the library if you provide a non-thread-safe counter.
@jeremy I've sent you an email discussing this PR. Thank you for this gem and your time :)