[racket] Void expression found

From: Benjamin Greenman (blg59 at cornell.edu)
Date: Tue Jan 6 19:05:24 EST 2015

>
> From a practical point of view, at the low level the implementation is
> heavily optimized for functions that return exactly one value.
> Functions that return a different number of values are slower.
>

Does this mean I'm better off returning (cons a b) than (values a b)?
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