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= New Features
* The association_pks plugin now creates *_pks_dataset methods for
each association. These are similar to the existing *_pks getter
methods, but they return a dataset of the keys instead of the keys
themselves.
* The association_pks plugin now supports a :cache_pks association
option, which will cache calls to the *_pks getter method. The
default behavior remains that the *_pks getter method only returns
cached values if the *_pks= setter method has been used to set the
values.
* The *_pks getter methods supported by the association_pks plugin
now support a :refresh option to ignore any cached values, similar
to how the association getter methods work.
= Other Improvements
* If trying to disconnect a server that doesn't exist when using a
sharded connection pool, a Sequel::Error is now raised. Previously,
the sharded threaded pool raised a NoMethodError and the sharded
single connection pool did not raise an error.
* If using the :savepoint option when savepoints are not supported,
a Sequel::InvalidOperation exception is now raised, instead of a
NoMethodError.
* Calling Dataset#eager_graph with no arguments now returns the
dataset.
* If not connected to the database, the single connection pool will
not yield any connections to Database#pool.all_connections.
* Forcing a :ruby eager limit strategy for an association without a
limit or offset now works correctly.
* Multiple unnecessary conditionals have been removed.
* Sequel core and model code now have 100% branch coverage.
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