Question: VectorCalculus:-DirectionalDiff problem

I was setting up a worksheet for my vactor calculus class and tried to show how the DifferentialDiff command from the VectorCalculus package was limited.  I was expecting to have it give undefined or something similar for all directions with the function I am using.  Unfortunately, I got 0 when the directional derivative is truly undefined and I got undefined when the directional derivative is 0.

This is the code I am using.  Unfortunately, this site will not take the worksheet or plot the function for me.

s := min(abs(x),abs(y));



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