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= New Features
* An instance_specific_default plugin has been added for setting the
default for the :instance_specific association option, or
warning/raises in cases where it is not specified. This allows
you to easily find associations that would be considering instance
specific by default, and mark them as not instance specific for
better performance.
= Other Improvements
* Setting the :instance_specific association option to false now
works correctly if the association uses a block. Associations
that set the :dataset option are now always considered instance
specific, even if the :instance_specific option is explicitly
passed.
* The validation_class_methods plugin now considers all :if,
:allow_missing, :allow_nil, and :allow_blank options. Previously,
it only considered the first of those options that was set.
* Model.finalize_associations no longer breaks if you have
instance-specific associations.
* Model.plugin now warns if you load the plugin with arguments or a
block if the plugin does not accept arguments or block. This is
because a future change to Sequel could break the call.
* When emulating unsupported alter table operations on SQLite, Sequel
now copies composite unique constraints unless the alter table
operation is the dropping of a unique constraint.
* Sequel now recognizes an additional disconnect error in the oracle
adapter.
* In the run_transaction_hooks extension, calling
run_after_{commit,rollback}_hooks now raises the correct exception
class.
* In the pg_range extension, conversion procs for the tsrange[] and
tstzrange[] types are not added unless the Database uses the
pg_array extension.
* Multiple unnecessary conditionals in plugins and extensions have
been removed.
* Sequel plugin and extension code now have 100% branch coverage.
* Sequel now avoids a statement not reached verbose warning in
Dataset#clone.
= Backwards Compatibility
* The output of Dataset#to_dot in the to_dot extension has changed
slightly, including hash entries with nil keys. These entries
were previously ignored.
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