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= Improvements
* Running migrations using one of the included migrators on separate
Database objects in separate threads simultaneously is now
supported. Previously, the migrators were not thread-safe.
* On Ruby 2.5+, :db_type entries in the schema hashes are now deduped
for a slight memory savings when using many columns with the same
database type.
* The schema_caching extension now freezes string values in the
resulting hashes, just as the default schema parsing code started
doing in 5.5.0.
* The schema_caching extension now supports the :callable_default
schema values used by the pg_json, pg_array, and pg_hstore
extensions, by removing the entry before caching and resetting it
after restoring the cache.
* Identifier mangling rules are now respected when renaming columns on
Microsoft SQL Server.
= Backwards Compatibility
* The migrator internals were modified in order to support
thread-safety. The private Migrator#remove_migration_classes
method has been removed, and #load_migration_file now returns the
migration object/class instead of populating Migration.descendants.
Migration.descendants is now only used for temporary storage, and
will no longer contain all migration objects/classes used by the
migrator.
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