Description

This works with yaml

App\Example:
    calls:
      - method: addOptions
        arguments:
          - key_1: "value_1"
            !php/const App\Example::CONSTANT_1: 'value_0'

I can use constant in a collection entry key. I'd like to use the same with XML config.

Example

Currently I can use constant for value but not a key

<argument type="collection">
    <argument type="constant" key="Symfony\Component\Serializer\Normalizer\DateTimeNormalizer::FORMAT_KEY">DATE_ATOM</argument>
</argument