def backoff(start, stop, count=None, factor=2.0, jitter=False):
    """Returns a list of geometrically-increasing floating-point numbers,
    suitable for usage with `exponential backoff`_. Exactly like
    :func:`backoff_iter`, but without the ``'repeat'`` option for
    *count*. See :func:`backoff_iter` for more details.

    .. _exponential backoff: https://en.wikipedia.org/wiki/Exponential_backoff

    >>> backoff(1, 10)
    [1.0, 2.0, 4.0, 8.0, 10.0]
    """
    if count == 'repeat':
        raise ValueError("'repeat' supported in backoff_iter, not backoff")
    return list(backoff_iter(start, stop, count=count,
                             factor=factor, jitter=jitter))