Comment 1 for bug 314939

For my brief analysis of the problem, see: http://stackoverflow.com/questions/420300/lisp-need-help-getting-correct-behaviour-from-sbcl-when-converting-octet-stream/425000#425000

In short, I think there might be a bug in mb-util.lisp. I haven't looked at the current version of the source, so this may or may not have been fixed since 1.0.18.