HP Prime bug for approximate(erfc(z)), z as (0+b*i), or erf(b*i)

[parisse]

I confirm a small bug for erfc if |z| is between 3 and 6.5 and re(z) is small (missed a 1 in real part). In this area, erf is computed with a continued fraction expansion
2*exp(z^2)*int(exp(-t^2),t=z..inf)=1/(z+1/2/(z+1/(z+3/2/(z+...))))
There is a warning of low accuracy if re(z) is small : I must indeed stop the fraction expansion and since we do not have multiprecision floats there are some wrong digits.