Workaround null & mixed being ReservedWords
Workaround null & mixed being ReservedWords

Symfony 6 added return types to most of it's signatures.

This is reported as ReservedWords by Psalm.

See https://github.com/vimeo/psalm/issues/7026 and https://github.com/doctrine/dbal/pull/5053 for more context.

cristianoc72/Propel2,cristianoc72/Propel2,propelorm/Propel2,propelorm/Propel2