## BC BREAK User-provided `PDO` instance is no longer supported
In order to share the same `PDO` instances between DBAL and other components, initialize the connection in DBAL and access it using `Connection::getWrappedConnection()->getWrappedConnection()`.
## BC BREAK PostgreSqlPlatform ForeignKeyConstraint support for `feferred` misspelling removed
`PostgreSqlPlatform::getAdvancedForeignKeyOptionsSQL()` had a typo in it in 2.x. Both the option name