@contextmanager<EOL><INDENT>def load_stream(self, key, binary=False):<DEDENT>
value = self.load_value(key, binary=binary)<EOL>yield io.BytesIO(value) if binary else io.StringIO(value)<EOL>
Return a managed file-like object from which the calling code can read
previously-serialized data.

:param key:
:return: A managed stream-like object