--- a/mercurial/debugcommands.py	Tue Jan 10 06:59:49 2017 +0800
+++ b/mercurial/debugcommands.py	Thu Jan 05 17:16:07 2017 +0000
@@ -445,7 +445,7 @@
         raise error.CommandError('debugdata', _('invalid arguments'))
     r = cmdutil.openrevlog(repo, 'debugdata', file_, opts)
     try:
-        ui.write(r.revision(r.lookup(rev)))
+        ui.write(r.revision(r.lookup(rev), raw=True))
     except KeyError:
         raise error.Abort(_('invalid revision identifier %s') % rev)