LGTM rsc will have to check it in though. thanks.
*** Submitted as http://code.google.com/p/plan9port/source/detail?r=27213bfba2ec *** acme: correct writes of runes on auspicious byte boundaries R=rsc, r CC=plan9port.codebot http://codereview.appspot.com/6586067 Committer: Russ Cox <rsc@swtch.com>