bug producing repeated elements in antik's iterate extension?

Hello,

A StackOverflow user posted a question [1] about the behavior described in the Antik manual [2]

(defparameter m1 #m(1 2 3 ^ 0 6 8)) (iter:iter (iter:for e :matrix-element m1) (princ e) (princ " "))

;Output: 1.0 2.0 3.0 0.0 0.0 6.0 8.0

and observed that it looks like the 0.0 is getting repeated. In the answer to that question, I macroexpanded the iteration code, and it does look like a a value is getting repeated. Is this a (known) bug?

Thanks, Joshua Taylor

[1] http://stackoverflow.com/q/17119812/1281433 [2] http://www.common-lisp.net/project/antik/antik/Iterate.html