What the!! that's great!
It'll come in very handy, modelling without thinking about calculations, just pure design and creativity.
It looks like with technology, the way it's going, the designer is heading in the direction of the check out operator at the supermarket, where the operator waits for the cash register to calculate the change for them, $1.50 from $2.00 is.......wait.......the cash register says 50c :)

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