called :attr:`.TypeDecorator.coerce_to_is_types`,
to make it easier to control how comparisons using
``==`` or ``!=`` to ``None`` and boolean types goes
about producing an ``IS`` expression, or a plain
equality expression with a bound parameter.
[ticket:2744]

- some whitespace

Support for Postgres range types.

- docs

entities against the same base class joined to each other as well
would not track columns on the base table independently of each other if
the string of joins were more than two entities long.  Also in 0.8.2.
[ticket:2759]