Hi !

In app/config/config.yml, this 2 configurations should have same behavior :

framework:
    form: ~

framework:
    # no form key

But first one enable form, and second one, disable it (framework.form.enabled default value is false : https://symfony.com/doc/current/reference/configuration/framework.html#reference-form-enabled)

Or maybe ~ is not exactly same as "default values" ?
In this case, how can we know differences between ~ and default values ?