File uploads via plone.restapi trigger these resource warnings
/home/ajung/sandboxes/ugent-portaal-plone-4x/eggs/ZODB-5.5.1-py3.6.egg/ZODB/blob.py:339: ResourceWarning: unclosed file <_io.FileIO name='/tmp/BUCe14dcpak' mode='rb' closefd=True>
super(BlobFile, self).close()
Is this related to ZODB or Plone/plone.restapi?