/guava/guava/src/com/google/common/math/StatsAccumulator.java
return value;
return NaN;
static double calculateNewMeanNonFinite(double previousMean, double value) { if (isFinite(previousMean)) { return value; } else if (isFinite(value) || previousMean == value) { return previousMean; } else { <extra_id_0> } } }