git cl checkout: reall fix it.

git_cl.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Copyright (C) 2008 Evan Martin <martine@danga.com>
 
 """A git-command for integrating reviews on Rietveld and Gerrit."""
 
 from distutils.version import LooseVersion
@@ skipping 4526 matching lines @@
   _, args = parser.parse_args(args)
 
   if len(args) != 1:
     parser.print_help()
     return 1
 
   issue_arg = ParseIssueNumberArgument(args[0])
   if not issue_arg.valid:
     parser.print_help()
     return 1
-  target_issue = issue_arg.issue
+  target_issue = str(issue_arg.issue)
 
   key_and_issues = [x.split() for x in RunGit(
       ['config', '--local', '--get-regexp', r'branch\..*\.rietveldissue'])
       .splitlines()]
   branches = []
   for key, issue in key_and_issues:
     if issue == target_issue:
       branches.append(re.sub(r'branch\.(.*)\.rietveldissue', r'\1', key))
 
   if len(branches) == 0:
@@ skipping 70 matching lines @@
 if __name__ == '__main__':
   # These affect sys.stdout so do it outside of main() to simplify mocks in
   # unit testing.
   fix_encoding.fix_encoding()
   setup_color.init()
   try:
     sys.exit(main(sys.argv[1:]))
   except KeyboardInterrupt:
     sys.stderr.write('interrupted\n')
     sys.exit(1)