HI,

I've noticed a problem in the CCL backend, when the socket is created not with the default external-format but with NIL external-format which causes the fallback to ISO-8859-1 and is rather unfortunate. What's even worse is that it's very hard to alter the format, while initializing it from ccl:*default-external-format* makes it possible to control this parameter.

So here's a small change that solves the problem. It's against v.0.5.5, but I've looked at the code for 0.6.1 and didn't see any change there. If someone points me to the sources, I can make a proper patch. 

diff -u openmcl-new.lisp openmcl.lisp
--- openmcl-new.lisp 2013-02-18 19:18:25.482382100 +0200
+++ openmcl.lisp 2013-02-18 19:16:24.586378860 +0200
@@ -97,6 +97,7 @@
   :local-port local-port
   :format (to-format element-type)
   :deadline deadline
+  :external-format ccl:*default-external-format*
   :nodelay nodelay
   :connect-timeout timeout)))
  (make-stream-socket :stream mcl-sock :socket mcl-sock)))
@@ -107,6 +108,7 @@
                                            :local-host (when local-host (host-to-hostname local-host))
                                            :local-port local-port
    :input-timeout timeout
+                                           :external-format ccl:*default-external-format*
                                            :format :binary))
               (usocket (make-datagram-socket mcl-sock)))
  (when (and host port)

Best,

Vsevolod Dyomkin
+38-096-111-41-56
skype, twitter: vseloved