code: async def dump_message_field(obj, msg, field, field_archiver=None):
      
      fname, ftype, params = field[0], field[1], field[2:]
      fvalue = getattr(msg, fname, None)
      field_archiver = field_archiver if field_archiver else dump_field
      return await field_archiver(eref(obj, fname, True), fvalue, ftype, params)
docs: Dumps a message field to the object. Field is defined by the message field specification.
  
      :param obj:
      :param msg:
      :param field:
      :param field_archiver:
      :return: