I usually am explicit in saying something along the lines of "Can it be assumed that I know how to do argument null checking, if possible, and not pollute the w

I usually am explicit in saying something along the lines of "Can it be assumed that I know how to do argument null checking, if possible, and not pollute the whiteboard?" and I've gotten a "Yes" and then after writing the function on the whiteboard: "Well what about <something relating to argument nullability>?"...so you should ask but YMMV