diff --git a/mercurial/utils/stringutil.py b/mercurial/utils/stringutil.py
--- a/mercurial/utils/stringutil.py
+++ b/mercurial/utils/stringutil.py
@@ -114,7 +114,7 @@
     elif callable(r):
         return r()
     else:
-        return pycompat.byterepr(r)
+        return pprint(r)
 
 def binary(s):
     """return true if a string is binary data"""