It would help to clarify that the first index to f is the index in vec,
so the values go from n-1 to 0.

For example one could replace the first example by:

(vector-unfold-right (λ (i) (values (cons i x) (+ x 1))) 5 0)
#=> ((0 . 4) (1 . 3) (2 . 2) (3 . 1) (4 . 0))

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	--Per Bothner
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