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= New Features
* The tree and rcte_tree plugins now support composite keys.
* An error_sql Database extension has been added. This extension
adds the DatabaseError#sql method, which should return the
database query that caused the error. This is useful for
drivers that don't include the SQL used as part of the error
message.
= Other Improvements
* Empty blobs are now literalized correctly on MySQL.
* Empty arrays are now literalized correctly on PostgreSQL <8.4.
* In the pagination extension, Dataset#page_count is now 1 even if
the dataset is empty. This fixes issues with last_page? and
page_range returning bad values for empty datasets.
* In the pagination extension, calling Dataset#each_page without a
block now returns an Enumerator.
* Dataset#qualify and Sequel.delay now work together, qualifying
the object returned by the delayed evaluation.
* Migrator.migrator_class is now a public method.
* The PostgreSQL citext type is now recognized as a string.
* Another disconnect error is now recognized in the jdbc/as400
adapter.
* Guides about using and creating Sequel extensions and model
plugins have been added.
= Backwards Compatibility
* If you were expecting Dataset#page_count on a empty paginated
dataset to return 0, you need to update your code.
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