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Added note on YAML mappings as objects

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`@@ -148,6 +148,20 @@ error if something goes wrong by adding the filename to the message.`
`148`	`148`
`149`	`149`	`.. _components-yaml-dump:`
`150`	`150`
	`151`	`+Objects for Mappings`
	`152`	`+....................`
	`153`	`+`
	`154`	`+..versionadded::2.7`
	`155`	`+ Support for parsing mappings as objects was introduced in Symfony 2.6.`
	`156`	`+`
	`157`	+Yaml:ref:`mappings<yaml-format-collections>` are basically associative
	`158`	`+arrays. You can instruct the parser to return mappings as objects (i.e.`
	`159`	+``\stdClass`` instances) by setting the fourth argument to ``true``::
	`160`	`+`
	`161`	`+ $object = Yaml::parse('{"foo": "bar"}', false, false, true);`
	`162`	`+ echo get_class($object); // stdClass`
	`163`	`+ echo $object->foo; // bar`
	`164`	`+`
`151`	`165`	`Writing YAML Files`
`152`	`166`	`~~~~~~~~~~~~~~~~~~`
`153`	`167`

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`@@ -165,6 +165,8 @@ YAML uses the ISO-8601 standard to express dates:`
`165`	`165`	`# simple date`
`166`	`166`	`2002-12-14`
`167`	`167`
	`168`	`+.. _yaml-format-collections:`
	`169`	`+`
`168`	`170`	`Collections`
`169`	`171`	`-----------`
`170`	`172`

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