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Commitabc5d28

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minor#20877 [Serializer] (re)document PRESERVE_EMPTY_OBJECTS (94noni)
This PR was submitted for the 7.2 branch but it was squashed and merged into the 6.4 branch instead.Discussion----------[Serializer] (re)document PRESERVE_EMPTY_OBJECTS👋🏻when implementing a web hook, I had to serialize en empty array as object, and found it was wrong (empty list not empty object)```php// json without flag'data' => [],"data":[],// json with flag'data' => new \ArrayObject(),"data":{},```this PR (re)adds this feature as I thinks its useful to have it directly showcased in the main docweirdly it was present in v5.4#16977Commits-------ce28629 [Serializer] (re)document PRESERVE_EMPTY_OBJECTS
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‎serializer.rst‎

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@@ -1571,6 +1571,13 @@ to ``true``::
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// $jsonContent contains {"name":"Jane Doe"}
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Preserving Empty Objetcs
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~~~~~~~~~~~~~~~~~~~~~~~~
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By default, the Serializer will transform an empty array to `[]`.
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You can change this behavior by setting the ``AbstractObjectNormalizer::PRESERVE_EMPTY_OBJECTS`` context option
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to ``true``, when the value is `\ArrayObject()` the serialization would be `{}`.
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Handling Uninitialized Properties
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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