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.. change::
:tags: change, engine
:tickets: 7122
Some small API changes regarding engines and dialects:
* The :meth:`.Dialect.set_isolation_level`, :meth:`.Dialect.get_isolation_level`,
:meth:
dialect methods will always be passed the raw DBAPI connection
* The :class:`.Connection` and :class:`.Engine` classes no longer share a base
``Connectable`` superclass, which has been removed.
* Added a new interface class :class:`.PoolProxiedConnection` - this is the
public facing interface for the familiar :class:`._ConnectionFairy`
class which is nonetheless a private class.
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