That's okay.  I wrote a really fancy workaround, whose API consists of (S).

(: S (-> (Option String) String))
(define (S s)
  (cast S String))

By the way, Typed Racket picked up the second statically discovered bug as I 
keep moving stuff out of untyped modules.  Not surprisingly, neither bug had 
been discovered in usage, but both instances were valid possible uses of the 
system.   So, having to punt with (S) is an excellent tradeoff.

Thanks for continued Racket evolution.

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