Release Notes: - Fixed a (potential) small error in erf estimation. Technically, the error is negligible. I am not sure where the current calculation for erf come from and if it is intended or a simple mistake. However it looks slightly different from the official calculation, notably [this](https://en.wikipedia.org/wiki/Error_function#Approximation_with_elementary_functions) from Wikipedia. I will add a comment if it is intended.