v2.6.3

[![Build Status](https://travis-ci.org/doctrine/doctrine2.svg?branch=v2.6.3)](https://travis-ci.org/doctrine/doctrine2)

This release provides fixes for many things, specially:

- Regression in commit order calculation
- BC-break in `EntityManager#find()` using optimistic lock outside of
  transaction
- PHP 7.3 compatibility issues

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

- Total issues resolved: **8**
- Total pull requests resolved: **26**
- Total contributors: **26**

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

 - [7472: fix incorrect phpdoc typehint](doctrine#7472) thanks to @seferov
 - [7465: Fixes tiny typo in the 'Working with DateTime instances' documentation](doctrine#7465) thanks to @unguul
 - [7444: Fixed URLs of doctrine-mapping.xsd in docs](doctrine#7444) thanks to @Naitsirch
 - [7441: $hydrationMode throughout can be a string as well as int (for custom modes)](doctrine#7441) thanks to @asgrim
 - [7435: Fix a typo on Documentation](doctrine#7435) thanks to @oguzdumanoglu
 - [7434: Removed FAQ paragraph stating public variables are disallowed](doctrine#7434) thanks to @Naitsirch and @flaushi
 - [7423: Update association-mapping.rst](doctrine#7423) thanks to @ThomasLandauer
 - [7421: JIRA to Github issues on Limitations and Known Issues](doctrine#7421) thanks to @seferov
 - [7412: Some formatting improvements](doctrine#7412) thanks to @ThomasLandauer
 - [7411: Autoload error when following the Getting Started Guide](doctrine#7411) thanks to @ThomasLandauer
 - [7401: &doctrine#91;docs&doctrine#93; Fix docblock in `inheritance-mapping.rst`](doctrine#7401) thanks to @bobdenotter
 - [7397: Update getting-started.rst](doctrine#7397) thanks to @eibt
 - [7394: Class 'Doctrine\Common\Persistence\Mapping\Driver\AnnotationDriver' not found](doctrine#7394) thanks to @ekosynth
 - [7378: Typo fix](doctrine#7378) thanks to @BenMorel
 - [7377: Fix query andX doctype](doctrine#7377) thanks to @sserbin
 - [7374: Deprecation message in documentation for YAML](doctrine#7374) thanks to @SenseException and @iltar
 - [7360: Document getPartialReference() properly](doctrine#7360) thanks to @lcobucci

Bug
---

 - [7471: Fix parameter value processing for objects with unloaded metadata](doctrine#7471) thanks to @alcaeus
 - [7367: Fix for BC break in 2.6.2 when calling EM::find() with LockMode::OPTIMISTIC outside of a TX](doctrine#7367) thanks to @timdev
 - [7328: Handle removed parameters by tree walker in Paginator](doctrine#7328) thanks to @plfort
 - [7325: Make code php 7.3 lint-compatible](doctrine#7325) thanks to @paxal
 - [7317: &doctrine#91;XML&doctrine#93; Fix default value of many-to-many order-by to ASC](doctrine#7317) thanks to @alexdenvir
 - [7260: Fix the handling of circular references in the commit order calculator](doctrine#7260) thanks to @stof
 - [6830: fix applying column options on foreign key columns](doctrine#6830) thanks to @Tobion

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

 - [7428: CI: Test against PHP 7.3](doctrine#7428) thanks to @Majkl578
 - [7363: Fix compatibility with phan](doctrine#7363) thanks to @philippe-unitiz
 - [7345: Correct DOMDocument constructor in test](doctrine#7345) thanks to @guilliamxavier
 - [7307: Fix remaining usages of deprecated ClassLoader and Inflector from doctrine/common](doctrine#7307) thanks to @Majkl578 and @simonwelsh