- Added new test coverage for so-called "down adaptions" of SQL types,

where a more specific type is adapted to a more generic one - this
use case is needed by some third party tools such as ``sqlacodegen``.
The specific cases that needed repair within this test suite were that
of :class:`.mysql.ENUM` being downcast into a :class:`.types.Enum`,
and that of SQLite date types being cast into generic date types.
The ``adapt()`` method needed to become more specific here to counteract
the removal of a "catch all" ``**kwargs`` collection on the base
:class:`.TypeEngine` class that was removed in 0.9. [ticket:2917]

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