>I support the approach as the least cost incurring from a machine POV.
>Not having any idea on the nature of the fancy stuff makes me cautious ;-)
>
>I am pretty certain testing of value-alteration is more intensive with update,
>so if it gets really fancy, you might run into real trouble, like bugs in the product,
>or short-time trouble, having to test and seek out docs on fringe cases seldom encountered in such combination.
>
>As you are not a newbie and had the same first optim thoughts, I guess you already ran into something unexpected.
>A good compromize between your efforts and runtime might be to use the 2-step approach I spoke of...

Thanks, I will make some adjustment in the script, do some tests and see if I can something faster and reliable.