=== 5.0.0 (2017-09-01)
* Make bin/sequel -M option always use base 10 (jeremyevans)
* Don't use savepoints when creating indexes inside a transaction on databases
that don't support transactional schema modifications (jeremyevans) (#1407)
* Support :if_not_exists option when creating indexes on PostgreSQL 9.5+
(DyegoCosta) (#1405)
* Make threaded connection pools not block while connections are being made
(jeremyevans)
* SQL::Expression#clone and #dup now return self, since all expressions should
be frozen value objects (jeremyevans)
* Don't create empty arrays for unused association callbacks (jeremyevans)
* Cache association method name symbols instead of recomputing them everytime
(jeremyevans)
* Raise an exception if attempting to create a prepared statement using a
dataset with a delayed evaluation (jeremyevans)
* Make ConnectionPool#size thread safe by using the pool mutex (jeremyevans)
* Use instance_exec instead of instance_eval when passing a block, to work
with lambdas that accept no arguments (jeremyevans)
* Freeze SQL::StringAgg instances in string_agg extension (jeremyevans)
* Freeze SQL::DateAdd instances in date_arithmetic extension (jeremyevans)
* Freeze SQL::Expression.comparison_attrs (jeremyevans)
* Rename SQL::Subscript#f to #expression, keeping #f as an alias (jeremyevans)
* Require the :pool_class Database option be a class to use a custom
connection pool (jeremyevans)
* Make the class_table_inheritance plugin raise an Error during update if any
UPDATE query does not affect a single row (jeremyevans)
* Change most send calls to public_send unless calling private methods is
expected (jeremyevans)
* Database schema and schema generator methods now return nil (jeremyevans)
* Model#validates_unique in the validation helpers plugin now defaults to only
checking on new or modified values (jeremyevans)
* Deprecate Model#_before_validation (private_method), use
Model#before_validation now (jeremyevans)
* Always run before/after/around validation hooks when saving, even when not
validating the object (jeremyevans)
* Deprecate Model use_after_commit_rollback class and instance accessors
(jeremyevans)
* Deprecate Model.allowed_columns reader (jeremyevans)
* Freeze internal constants that shouldn't be modified at runtime (jeremyevans)
* Attempt to connect to the database immediately when creating the Database
instance (jeremyevans)
* Make association_pks plugin delay the setting of associated objects until
the current object is saved by default (jeremyevans)
* Joined datasets used as model datasets are now automatically wrapped in a
subquery (jeremyevans)
* Setting an invalid dataset for a model class now raises an exception by
default (jeremyevans)
* Getting all values for newly created models now happens before calling
after_create, instead of after (jeremyevans)
* Remove use of @was_new/@columns_updated instance variables when saving model
objects (jeremyevans)
* Disable symbol splitting by default (jeremyevans)
* Make datasets frozen by default (jeremyevans)
* Drop support for ruby 1.8.7, minimum now is 1.9.2 (jeremyevans)
* Remove deprecated adapters, extensions, plugins, constants, and features
(jeremyevans)
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