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Since the UoW checks each item of a *-to-many association to ensure it has the correct type, we should never say that we expect an instance of `Doctrine\Common\Collections\Collection` or an `array`.
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Doctrine 2 is an object-relational mapper (ORM) for PHP 7.0+ that provides transparent persistence for PHP objects. It sits on top of a powerful database abstraction layer (DBAL). One of its key features is the option to write database queries in a proprietary object oriented SQL dialect called Doctrine Query Language (DQL), inspired by Hibernate's HQL. This provides developers with a powerful alternative to SQL that maintains flexibility without requiring unnecessary code duplication.