ini: fix spelling of the CELERY_TASK_SERIALIZER It has "always" been wrong, and we have thus been using the default of "pickle" - not "json" as we thought. I doubt this change has any immediate visible impact. I guess it only means that it will use json for results instead of pickle. That might be more stable and debuggable. Note: celery_config will uppercase the config settings and replace '.' with '_', so 'celery.result.serializer' turns into 'CELERY_TASK_SERIALIZER'. CELERY_TASK_SERIALIZER is described on https://docs.celeryproject.org/en/3.1/configuration.html#celery-result-serializer https://docs.celeryproject.org/en/3.1/userguide/calling.html#serializers