async def blob(self, elem=None, elem_type=None, params=None):
elem_type = elem_type if elem_type else elem.__class__<EOL>if hasattr(elem_type, '<STR_LIT>'):<EOL><INDENT>elem = elem_type() if elem is None else elem<EOL>return await elem.blob_serialize(self, elem=elem, elem_type=elem_type, params=params)<EOL><DEDENT>if self.writing:<EOL><INDENT>return await x.dump_blob(self.iobj, elem=elem, elem_type=elem_type, params=params)<EOL><DEDENT>else:<EOL><INDENT>return await x.load_blob(self.iobj, elem_type=elem_type, params=params, elem=elem)<EOL><DEDENT>
Loads/dumps blob
:return: