Symfony version(s) affected

7.1

Description

There is no way to dump a YAML section "without values".

How to reproduce

Dumping the following "Docker Compose volumes section":

$yaml = Yaml::dump([
  'volumes' => [
    'db-data' => null,
  ],
]);

Will result in:

volumes:
    db-data: null

Using an empty string istead will result in:

volumes:
    db-data: ''

There is actually no way to dump "without value" like:

volumes:
    db-data:

Possible Solution

No response

Additional Context

No response