diff -r 4cc3797aa59c -r f8e06821c118 mercurial/store.py
--- a/mercurial/store.py	Thu Mar 02 13:27:42 2017 +0100
+++ b/mercurial/store.py	Wed Mar 08 00:40:15 2017 +0530
@@ -101,7 +101,7 @@
     e = '_'
     if pycompat.ispy3:
         xchr = lambda x: bytes([x])
-        asciistr = [bytes(a) for a in range(127)]
+        asciistr = [bytes([a]) for a in range(127)]
     else:
         xchr = chr
         asciistr = map(chr, xrange(127))
@@ -128,7 +128,7 @@
                     pass
             else:
                 raise KeyError
-    return (lambda s: ''.join([cmap[c] for c in s]),
+    return (lambda s: ''.join([cmap[s[c:c + 1]] for c in xrange(len(s))]),
             lambda s: ''.join(list(decode(s))))
 
 _encodefname, _decodefname = _buildencodefun()