Return an upper bound on :meth:`ratio` relatively quickly.
- This isn't defined beyond that it is an upper bound on :meth:`ratio`, and
- is faster to compute.
-
.. method:: real_quick_ratio()
Return an upper bound on :meth:`ratio` very quickly.
- This isn't defined beyond that it is an upper bound on :meth:`ratio`, and
- is faster to compute than either :meth:`ratio` or :meth:`quick_ratio`.
The three methods that return the ratio of matching to total characters can give
different results due to differing levels of approximation, although