Bug in power function

[CognitiveGrowth]

x=normal(0,1)
pow(x,2)

yields the error message

Distribution Math Error: Operation returned complex result

This doesn't make sense because the square of a real number is always a positive real number and never a complex number.

I encountered this error while testing my own implementation of a function for calculating the standard deviation of a random variable. I was very surprised that stdev and other elementary functions haven't been implemented yet.