Add hit/miss counting, but not mutex for thread safety. #3
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I looked into adding a mutex around Intern() but it seemed to cost about 10% CPU performance. It was a little hard to tell as the benchmark values weren't 100% stable.
Regardless this should address feedback from the previous PR and then add hit/miss counters. I added the counters because you can't see it from the outside, while you can always just wrap the call in a mutex.