ben-manes / caffeine / #5689 / 1

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Align the 2Q in-queue default to the paper's recommendation

Johnson and Shasha recommend Kin ~= 25% (Kout ~= 50%); the default was
0.20 / 0.50. Match the paper. 2Q is insensitive to Kin in this range,
so the hit rate is unchanged on the bundled traces.

4192 of 4203 branches covered (99.74%)

8471 of 8475 relevant lines covered (99.95%)

1.0 hits per line