fix contract
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@ -14,7 +14,7 @@
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#:pref [pref symbol?]
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#:dir? [dir? boolean?])
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[res (dir?)
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(if dir?
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(if (or dir? (not (equal? dir? the-unsupplied-arg)))
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(listof path?)
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(or/c path? #f))])]))
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