mercurial/context.py

--- a/mercurial/context.py	Mon Aug 29 18:02:09 2016 -0700
+++ b/mercurial/context.py	Wed Aug 31 12:46:53 2016 -0700
@@ -528,7 +528,7 @@
 
     @propertycache
     def _manifest(self):
-        return self._repo.manifestlog[self._changeset.manifest]
+        return self._repo.manifestlog[self._changeset.manifest].read()
 
     @propertycache
     def _manifestdelta(self):