[racket] Optional parameters in Typed Racket?

From: Sean Kanaley (skanaley at gmail.com)
Date: Sat Apr 26 08:42:29 EDT 2014

According to Sam according to google


(: append-bar (case-> (String Positive-Integer -> String)
                      (String -> String)))
(define (append-bar str [how-many 1])
  (apply string-append str (make-list how-many "bar")))

How come pasting in gmail expands the previous email quote?
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