doctrine/dbal 2.7.2 -> 2.8.0 Backwards Compatibility (BC) breaks

BC-BREAKS.txt

[BC] CHANGED: Type documentation for property Doctrine\DBAL\Connection#$_conn changed from \Doctrine\DBAL\Driver\Connection to \Doctrine\DBAL\Driver\Connection|null
[BC] CHANGED: Type documentation for property Doctrine\DBAL\Connections\MasterSlaveConnection#$connections changed from \Doctrine\DBAL\Driver\Connection[] to \Doctrine\DBAL\Driver\Connection[]|null[]
[BC] CHANGED: Type documentation for property Doctrine\DBAL\Connection#$_conn changed from \Doctrine\DBAL\Driver\Connection to \Doctrine\DBAL\Driver\Connection|null
[BC] CHANGED: Type documentation for property Doctrine\DBAL\Connection#$_conn changed from \Doctrine\DBAL\Driver\Connection to \Doctrine\DBAL\Driver\Connection|null
[BC] SKIPPED: Provided node "Symfony\Component\Console\Command\Command" is not class, but "interface"
[BC] SKIPPED: Provided node "Symfony\Component\Console\Command\Command" is not class, but "interface"
[BC] SKIPPED: Provided node "Symfony\Component\Console\Command\Command" is not class, but "interface"
[BC] SKIPPED: Provided node "Symfony\Component\Console\Helper\Helper" is not class, but "interface"
[BC] SKIPPED: Constant "OCI_COMMIT_ON_SUCCESS" has not been defined
[BC] SKIPPED: Constant "OCI_BOTH" has not been defined
[BC] CHANGED: Property Doctrine\DBAL\Driver\Mysqli\MysqliStatement::$_paramTypeMap changed default value from array (
  2 => 's',
  5 => 'i',
  0 => 's',
  1 => 'i',
  3 => 's',
) to array (
  2 => 's',
  16 => 's',
  5 => 'i',
  0 => 's',
  1 => 'i',
  3 => 's',
)
[BC] CHANGED: Type documentation for property Doctrine\DBAL\Connection#$_conn changed from \Doctrine\DBAL\Driver\Connection to \Doctrine\DBAL\Driver\Connection|null
[BC] CHANGED: Value of constant Doctrine\DBAL\Version::VERSION changed from '2.7.2' to '2.8.0'
[BC] CHANGED: Type documentation for property Doctrine\DBAL\Schema\TableDiff#$removedForeignKeys changed from \Doctrine\DBAL\Schema\ForeignKeyConstraint[] to \Doctrine\DBAL\Schema\ForeignKeyConstraint[]|string[]
[BC] CHANGED: Type documentation for property Doctrine\DBAL\Schema\Table#$_schemaConfig changed from \Doctrine\DBAL\Schema\SchemaConfig to \Doctrine\DBAL\Schema\SchemaConfig|null