…nglas)

This PR was submitted for the master branch but it was merged into the 2.7 branch instead (closes #17281).

Discussion
----------

[Serializer] Unset object_to_populate after using it

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

The `object_to_populate` key must be unset after using it to avoid problems when normalizing sub objects. Needed for #17193.

Commits
-------

ff18b68 [Serializer] Unset object_to_populate after using it

…ursive denormalization and hardening) (mihai-stancu, dunglas)

This PR was merged into the 3.1-dev branch.

Discussion
----------

	[Serializer] Integrate the PropertyInfo Component (recursive denormalization and hardening)

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #16143, #17193, #14844
| License       | MIT
| Doc PR        | todo

Integrates the PropertyInfo Component in order to:

* denormalize a graph of objects recursively (see tests)
* harden the hydratation logic

The hardening part is interesting. Considering the following example:

```php
class Foo
{
    public function setDate(\DateTimeInterface $date)
    {
    }
}

// initialize $normalizer
$normalizer->denormalize(['date' => 1234], Foo::class);
```

Previously, a PHP error was thrown because the type passed to the setter (an int) doesn't match the one checked with the typehint. With the PropertyInfo integration, an `UnexpectedValueExcption` is throw instead.
It's especially interesting for web APIs dealing with JSON documents. For instance in API Platform, previously a 500 error was thrown, but thanks to this fix a 400 HTTP code with a descriptive error message will be returned. (/cc @csarrazi @mRoca @blazarecki, it's an alternative to https://github.com/dunglas/php-to-json-schema for protecting an API).

/cc @mihai-stancu

Commits
-------

5194482 [Serializer] Integrate the PropertyInfo Component
6b464b0 Recursive denormalize using PropertyInfo