Add64 returns: 1) a + b 2) If there is overflow, an error.

Max64 returns the maximum of the values provided.

Min returns the minimum of the values provided.

Min64 returns the minimum of the values provided.

Mul64 returns: 1) a * b 2) If there is overflow, an error.

Sub64 returns: 1) a - b 2) If there is underflow, an error.

Averager tracks a continuous time exponential moving average of the provided values.