How can I use config-set to "unset" the value of a variable? I am trying to use config-set to "unset" a variable.  In this case, I have a media image field that has required crop types on it, which is breaking my behat tests, so I want to use drush to temporarily disable the requirement during the behat tests.

I tried something like this:

drush -y config-set core.entity_form_display.media.image.default content.field_media_image.settings.crop_types_required ''

But this breaks the config.  What's the correct way to "unset" a config value?
Use config-delete, not config-set:

drush -y config-delete core.entity_form_display.media.image.default content.field_media_image.settings.crop_types_required

Despite the name, config-delete does not delete any of your config .yml files; it only "deletes" the config inside the database.