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= New Features
* A pg_xmin_optimistic_locking plugin has been added. This plugin
uses PostgreSQL's xmin system column to implement optimistic
locking. The xmin system column is automatically updated whenever
the database row is updated. You can load this plugin into a
base model and have all models that subclass from it use optimistic
locking, without needing any user-defined lock columns.
= Other Improvements
* set_column_allow_null is now a reversible migration method inside
alter_table blocks.
* The use of ILIKE no longer forces the ESCAPE clause on PostgreSQL,
which allows the use of ILIKE ANY and other constructions. There
is no need to use the ESCAPE clause with ILIKE, because the value
Sequel uses is PostgreSQL's default.
* The xid PostgreSQL type is now recognized as an integer type in the
jdbc/postgresql adapter.
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