compat.get_session passes a tuple to pip where it should only pass the options group

[techalchemy]

>>> pip_compat.get_session(install_cmd=cmd, options=cmd.cmd_opts)                                                                                                             
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/techalchemy/.virtualenvs/requirementslib-JzdulSRB/lib/python3.8/site-packages/pip_shims/compat.py", line 416, in get_session
    session = install_cmd._build_session(options)  # type: ignore
  File "/home/techalchemy/.virtualenvs/requirementslib-JzdulSRB/lib/python3.8/site-packages/pip/_internal/cli/req_command.py", line 83, in _build_session
    assert not options.cache_dir or os.path.isabs(options.cache_dir)
AttributeError: 'OptionGroup' object has no attribute 'cache_dir'