>Then it begs to ask the question, what do you do if it fails
>verification at one of the Vdd extremes? Reprogram? Discard?

I could envisage a production item where the power supply is close to one 
extreme of the tolerance, and a chip that failed verification at the extreme 
being fitted and getting intermittent errors in operation as a result. Hence 
a verification failure caught at programming time, at supply extremes has a 
good chance of keeping production out of the quagmire. 

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