models shared True
# forms_read_only in-process sync, in-process async
create_item
  > POST /items [multipart/form-data; boundary=<boundary>]
  create_item(body=ItemRequest(filter=Filter(id='f-1')))
  < 204 -
  = None
create_item empty
  > POST /items [multipart/form-data; boundary=<boundary>]
  create_item(body=ItemRequest(filter=None))
  < 204 -
  = None
