$ sage --package download cbc
Traceback (most recent call last):
  File "/home/slabbe/GitBox/sage/build/bin/sage-package", line 42, in <module>
    run()
  File "/home/slabbe/GitBox/sage/build/bin/../sage_bootstrap/cmdline.py", line 318, in run
    app.download_cls(args.package_name, args.allow_upstream)
TypeError: download_cls() takes exactly 2 arguments (3 given)