Symfony version(s) affected

Since the introduction of Serializer up until 7.4+

Description

When we create a class property where the name starts with is (followed by an uppercase letter) and we create a getter method of the same name, the serializer will remove the is prefix in the normalized array.

E.g. having the following class:

class MyClass {
  private bool $isOwner = true;

  public function isOwner(): bool {
    return $this->isOwner;
  }

  public function setIsOwner(bool $isOwner): void {
    $this->isOwner = $isOwner;
  }
}

Doing a serialization to JSON results in

{
  "owner": true
}

If we try to denormalize it again, the property will be ignored. It works if the key in the JSON object is named isOwner, though.

This means normalization and denormalization are inconsistent.

Sidenote: When using the JetBrains IDE Generate Getter feature on a boolean property called like $isX, it will automatically create an isser method with the same name like the property. This is how I ran into this.

How to reproduce

Use MyClass from the description and run

$classMetadataFactory = new ClassMetadataFactory(new AttributeLoader());
$normalizer = new ObjectNormalizer($classMetadataFactory);

$object = new MyClass();
$normalized = $normalizer->normalize($object);

/*
inspecting $normalized in the debugger:

$normalized = [
  'owner' => true
]
*/

Possible Solution

I propose to keep the is prefix in the resulting attribute, if there is a property exactly named like this. I will create a PR for that.

Additional Context

Edit: Also see PR #61097 for further getter-like methods where this happens: getters, issers, hassers, canners.