v2.6.4

[![Build Status](https://travis-ci.org/doctrine/orm.svg?branch=v2.6.4)](https://travis-ci.org/doctrine/orm)

In this release we've fixes many bugs (including a performance regression) and
made the v2.x series compatible with PHP 7.4.

--------------------------------------------

- Total issues resolved: **11**
- Total pull requests resolved: **32**
- Total contributors: **30**

Improvement
-----------

 - [7785: Fix "access array offset on value of type null" PHP 7.4 notices](doctrine#7785) thanks to @mlocati
 - [7142: Rename this repository to doctrine/orm](doctrine#7142) thanks to @greg0ire

Bug
------------------

 - [7821: Bug: doctrine#7820 paginator ignores dbal type conversions in identifiers](doctrine#7821) thanks to @Ocramius
 - [7778: Guard L2C regions against corrupted data](doctrine#7778) thanks to @umpirsky
 - [7767: PersistentCollection::matching() does not respect the collections native sorting](doctrine#7767) thanks to @stephanschuler
 - [7766: Respect collection orderBy meta when matching()](doctrine#7766) thanks to @stephanschuler
 - [7761: Do not modify UOW on PersistentCollection::clear() when owner has DEFFERED&doctrine#95;EXPLICIT change tracking policy](doctrine#7761) thanks to @paxal
 - [7750: Fix incorrect return of null values in L2C](doctrine#7750) thanks to @AlexSmerw
 - [7737: Fix MEMBER&doctrine#95;OF comparison when using criteria in query builder](doctrine#7737) thanks to @Smartel1
 - [7735: Null in fields value in Cached Entity several times on day on high-load project.](doctrine#7735) thanks to @AlexSmerw
 - [7630: Fix doctrine#7629 - `scheduledForSynchronization` leaks memory when using `@ORM\ChangeTrackingPolicy("DEFERRED&doctrine#95;EXPLICIT")`](doctrine#7630) thanks to @yethee
 - [7528: Prevent `UnitOfWork` lookup for DBAL types specified in `Doctrine\ORM\Query#setParameter()`](doctrine#7528) thanks to @Ocramius
 - [7322: JoinedSubclassPersister pass identifier types on delete](doctrine#7322) thanks to @dennisenderink and @fred-jan
 - [7266: Call to a member function resolveAssociationEntries() on boolean {"detail":"&doctrine#91;object&doctrine#93; (Symfony\\Component\\Debug\\Exception\\FatalThrowableError(code: 0): Call to a member function resolveAssociationEntries() on boolean at /www/vendor/doctrine/orm/lib/Doctrine/ORM/Cache/DefaultQueryCache.php:140)"}](doctrine#7266) thanks to @mingmingxianseng
 - [4632: DDC-3789: Paginator does not convert entity ids if they are value objects](doctrine#4632) thanks to @doctrinebot

Documentation
-------------

 - [7818: Add note into docs about not using SimpleAnnotationReader](doctrine#7818) thanks to @SenseException
 - [7791: Fix preFlush event documentation stating incorrectly that flush can be called safely](doctrine#7791) thanks to @Steveb-p
 - [7753: Add ORM annotations in getting-started docs](doctrine#7753) thanks to @SenseException and @wajdijurry
 - [7744: Fixed a typo-error](doctrine#7744) thanks to @noobshow
 - [7732: &doctrine#91;Documentation&doctrine#93; Missing comma fix](doctrine#7732) thanks to @lchrusciel
 - [7729: Update DATE&doctrine#95;ADD and DATE&doctrine#95;SUB docs](doctrine#7729) thanks to @JoppeDC
 - [7672: Added cross-links to relevant documentation](doctrine#7672) thanks to @jschaedl
 - [7612: Update ordered-associations.rst](doctrine#7612) thanks to @spirlici
 - [7610: Change APC to OPcache in improving-performance.rst ](doctrine#7610) thanks to @smtchahal
 - [7596: Correct method names and broken link in docs](doctrine#7596) thanks to @mbessolov
 - [7577: Fix of single link to dbal docs in advanced-configuration.rst](doctrine#7577) thanks to @SenseException
 - [7572: Remove codeigniter Framework example](doctrine#7572) thanks to @SenseException
 - [7571: Fix typo in inheritance mappings docs](doctrine#7571) thanks to @batwolf
 - [7557: Change Stackoverflow tag to doctrine-orm](doctrine#7557) thanks to @malarzm
 - [7551: &doctrine#91;2.6&doctrine#93; Migrate repository name doctrine/doctrine2 -> doctrine/orm](doctrine#7551) thanks to @Majkl578
 - [7530: Documentation error typo fix: s/Used-defined/User-Defined](doctrine#7530) thanks to @vladyslavstartsev
 - [7519: doctrine#7518 Fixed type mismatch between `EntityRepository#&doctrine#95;&doctrine#95;construct()` and its documented constructor arguments](doctrine#7519) thanks to @koftikes
 - [7518: `EntityRepository::&doctrine#95;&doctrine#95;construct()` expects `Doctrine\ORM\EntityManager` instead of actual required `EntityManagerInterface`](doctrine#7518) thanks to @koftikes
 - [7490: Fix broken link](doctrine#7490) thanks to @vladyslavstartsev
 - [7483: Fixed a minor syntax issue](doctrine#7483) thanks to @javiereguiluz

CI
-----------------

 - [7794: Fix test compatibility with DBAL 2.10.x-dev](doctrine#7794) thanks to @lcobucci
 - [7731: Replace custom install script with add-on](doctrine#7731) thanks to @greg0ire
 - [7473: Incremental CS checks in 2.x branches](doctrine#7473) thanks to @Majkl578