# HG changeset patch
# User Yuya Nishihara <yuya@tcha.org>
# Date 1490515926 -32400
# Node ID 6ceb3c4c3ab6e4caf68c3ba0909878896af0faac
# Parent  addc392cc3d347749125775e078c9279a032b873
py3: fix slicing of byte string in revlog.compress()

I tried .startswith('\0'), but data wasn't always a bytes nor a bytearray.

diff -r addc392cc3d3 -r 6ceb3c4c3ab6 mercurial/revlog.py
--- a/mercurial/revlog.py	Sun Mar 26 16:31:01 2017 +0900
+++ b/mercurial/revlog.py	Sun Mar 26 17:12:06 2017 +0900
@@ -1488,7 +1488,7 @@
             # The revlog compressor added the header in the returned data.
             return '', compressed
 
-        if data[0] == '\0':
+        if data[0:1] == '\0':
             return '', data
         return 'u', data