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= New Features
* A set_literalizer extension has been added, for treating Set
instances in datasets similar to Array instances:
DB.extension :set_literalizer
DB[:table].where(column: Set.new([1, 2, 3]))
# SELECT FROM table WHERE (column IN (1, 2, 3))
= Improvements
* Sequel now avoids the use of singleton classes for datasets on Ruby
2.4+, instead creating a regular subclass whenever a dataset would
be extended via #extension or #with_extend. This significantly
improves performance, up to 20-40% for common dataset usage,
because it avoids creating new singleton classes for every dataset
clone, and it allows for cached method lookup.
* Database#tables and #views now support a :qualify option on Microsoft
SQL Server to returned qualified identifiers.
* The schema_dumper extension can now dump tables in non-default schemas
when using Microsoft SQL Server.
* The schema_dumper extension now correctly dumps string column sizes
when using Microsoft SQL Server.
= Backwards Compatibility
* Calling Sequel::Dataset.register_extension where the second argument
is not a module now issues a deprecation warning. Support for this
will be removed in Sequel 6.
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