Used by Variable/Connection.

https://github.com/apache/airflow/blob/894741e311ffd642e036b80d3b1b5d53c3747cad/airflow/secrets/metastore.py#L32

#
#
"""Serialized DAG and BaseOperator."""
from __future__ import annotations
import collections.abc
import datetime
import enum
import inspect
import logging
import warnings
import weakref
from dataclasses import dataclass
from inspect import signature
from typing import TYPE_CHECKING, Any, Collection, Iterable, Mapping, NamedTuple, Union
import cattr