# HG changeset patch
# User Augie Fackler <augie@google.com>
# Date 2017-03-12 05:49:49
# Node ID ef6888172437531d417cb361d630895051daed6f
# Parent  77270ec0cdd9af7a6d46f0cc7264c5002e9b5489

revlog: extract first byte of revlog with a slice so it's portable

diff --git a/mercurial/revlog.py b/mercurial/revlog.py
--- a/mercurial/revlog.py
+++ b/mercurial/revlog.py
@@ -1521,7 +1521,7 @@ class revlog(object):
         #
         # According to `hg perfrevlogchunks`, this is ~0.5% faster for zlib
         # compressed chunks. And this matters for changelog and manifest reads.
-        t = data[0]
+        t = data[0:1]
 
         if t == 'x':
             try: