lfs: use str for the open() mode when opening a blob for py3 The other fix for this was to leave the mode as bytes, and import `pycompat.open()` like a bunch of other modules do. But I think it's confusing to still use bytes at the python boundary, and obviously error prone. Grepping for ` open\(.+, ['"][a-z]+['"]\)` and ` open\(.+, b['"][a-z]+['"]\)` outside of `tests`, there are 51 and 87 uses respectively, so it's not like this is a rare direct usage. Differential Revision: https://phab.mercurial-scm.org/D8099

--- a/hgext/lfs/blobstore.py	Thu Jan 30 14:57:02 2020 +0100
+++ b/hgext/lfs/blobstore.py	Sat Feb 08 23:39:55 2020 -0500
@@ -128,7 +128,7 @@
     def open(self, oid):
         """Open a read-only file descriptor to the named blob, in either the
         usercache or the local store."""
-        return open(self.path(oid), b'rb')
+        return open(self.path(oid), 'rb')
 
     def path(self, oid):
         """Build the path for the given blob ``oid``.