SingleDetectorFit: Extra inputs are passed to OutputBuffer

Any extra inputs get passed to OutputBuffer, should this be a santised list or things OutputBuffer can actually accept? https://gitlab.esrf.fr/workflow/ewoksapps/ewoksfluo/-/blob/main/src/ewoksfluo/tasks/single_detector_fit/utils.py#L61

Context: in my graph i have some metadata that is passed to all nodes (retrieved from db), clearly this isn't something that should be passed to OutputBuffer.