Actually, ```raven.contrib.django``` does the same thing in https://github.com/getsentry/raven-python/blob/master/raven/contrib/django/models.py#L152

Also, when I tried to debug this in my code, it appears that ```kwargs``` doesn't contain ```exc_info``` and ```raven.base.Client``` has a comment that says:
> If exc_info is not provided, or is set to True, then this method will perform the ``exc_info = sys.exc_info()`` and the requisite clean-up for you.

in https://github.com/getsentry/raven-python/blob/master/raven/base.py#L580