stack overflow #196

We really like like this tool and have gotten some great feedback from it.

here is a function that causes stack overflow

(defn crash-me [s]
(when-not (empty? s)
(filter #{\0 \1 \2 \3 \4 \5 \6 \7 \8 \9 .} s)))

I am not sure exactly what the toxic combination is. (when (seq s) blah) seemed to fix it, and so did
filtering on #(or (Character/isDigit %) (= . %))

but thought you might find it useful to know that causes stack overflow.