Changes for clojure.core/char-array

dakrone on Wed, 29 Dec 2010
user> (char-array "asdf")
#<char[] [C@167fc18>

user> (seq (char-array "asdf"))
(\a \s \d \f)

user> (seq (char-array 10))
(\^@ \^@ \^@ \^@ \^@ \^@ \^@ \^@ \^@ \^@)