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= New Features
* A :preconnect Database option has been added, for automatically
creating the maximum number of connections to the database on
instantiation. This is useful when there is high latency for
initial connection setup, where Sequel's usual approach of
connecting as needed can cause pauses at runtime.
* Database#sharded? has been added for checking whether the Database
object uses multiple servers.
* Dataset#server? has been added, for returning a cloned dataset
associated with the given server/shard if the dataset does not
already have a server set. This returns the receiver if the
server has already been set or the Database is not sharded.
= Other Improvements
* Sequel now uses the correct shard when deleting model instances.
Previously, the correct shard was only used in the unoptimized
case, not in the optimized case.
* Sequel now uses the correct shard when using Dataset#insert_select
on PostgreSQL. This was first broken in the 4.13.0 release.
* Sequel now correctly handles Sequel::SQL::Blob instances used in
bound variables in the postgres adapter. Previously this resulted
in duplicate apostrophes being used.
* When using the jdbc/sqlite3 adapter with jdbc-sqlite3 3.8.7, Sequel
now handles date objects and empty blobs correctly, working around
bugs in the driver.
= Backwards Compatibility
* In the update_or_create plugin, Model.update_or_create now always
returns the object. Previously it would not return the object if
the object already existed but no updates were necessary.
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