docs: public static FMeasureCounts fromFPFNKeyCountSysCount(final double falsePositives,
        final double falseNegatives, final double keyCount, final double sysCount) {
      return new Builder()
        .falsePositives(falsePositives)
        .falseNegatives(falseNegatives)
        .numItemsInKey(keyCount)
        .numPredicted(sysCount).build();
    }