[plt-scheme] define -> define-values in DrScheme

Hi,
With the macro-stepper, I noticed that
#lang scheme
(define f  (λ (x) (+ x 1)))
turned into
(module page scheme  (#%module-begin   (define-values (f)     (lambda (x) (#%app + x (quote 1))))))
in DrScheme.
Why define-values ?
Thanks.
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