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[racket] Bug in TR for/sum: ??

From: Ray Racine (ray.racine at gmail.com)
Date: Thu Mar 28 15:56:59 EDT 2013		 
Is this a bug?

#lang typed/racket/base

(define: βns : (Vectorof Float) '#(1.0 2.0 3.0))
(define: χns : (Vectorof Float) '#(4.0 5.0 6.0))

(for/sum: : Float
  ([βn : Float (in-vector βns)]
   [χn : Float (in-vector χns)])
  (* βn χn))
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