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= Improvements
* Database#copy_into in the jdbc/postgresql adapter now works
correctly when using multibyte characters in strings.
* The alter_table add_foreign_key method is now reversible when the
:foreign_key_constraint_name option is used.
* The jdbc/h2 and jdbc/hsqldb adapters now respect the
:foreign_key_constraint_name option.
* Calling Model.freeze on an already frozen model no longer raises
an error.
* An unnecessary database query is now avoided when loading the
pg_inet extension when the pg_array extension is already loaded.
* A better exception message is now used when migrating with an
empty migration directory.
= Backwards Compatibility
* Model.allowed_columns has been removed. Use the whitelist_security
plugin if you want to call it.
* Model use_after_commit_rollback class and instance accessors have
been removed.
* Support for the Model#_before_validation method has been removed.
* The private Model.plugin_module_defined? method has been removed.
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