loaddata with UUIDs as natural foreign keys does not work anymore

[Gunnar Scherf]

When I run dumpdata with a model which has a UUIDField as a natural key, the dump can not be loaded anymore.

manage.py dumpdata --natural-foreign  myapp
manage.py loaddata  myapp

The model :

class ApplicationManager(models.Manager):
    def get_by_natural_key(self, uuid):
        return self.get(uuid=uuid)

class Application(models.Model):
    uuid = models.UUIDField(unique=True, default=uuid.uuid4, editable=True)
    ...

The dump looks like this

[
{
  "model": "accounts.applicationrole",
  "fields": {
    "application": [
      "ec1e39cb-e3e7-46c7-87b7-70ace4165d13"
    ],
    ...

The error message in loaddata is:

'(UUID('ec1e39cb-e3e7-46c7-87b7-70ace4165d13'),)' is not a valid UUID.