Python 3.9.10 breaks requests-cache with "TypeError: Invalid first argument to register(). ForwardRef(...) is not a class

[hunkyburrito]

Describe the bug

This problem is not specific to anime downloader. See requests-cache#501

The fix to this issue is already implemented in requests-cache==0.9.1 so installing that version will resolve the problem.

To reproduce

Use python 3.9.10 environment

anime

LOG

~ $ anime                                                                         
Traceback (most recent call last):                                                  
File "/data/data/com.termux/files/usr/bin/anime", line 33, in <module>              
sys.exit(load_entry_point('anime-downloader==5.0.18', 'console_scripts', 'anime')())                                                                              
File "/data/data/com.termux/files/usr/bin/anime", line 25, in importlib_load_entry_point                                                                              
return next(matches).load()                                                     
File "/data/data/com.termux/files/usr/lib/python3.10/importlib/metadata/__init__.py", line 171, in load                                                               
module = import_module(match.group('module'))                                   
File "/data/data/com.termux/files/usr/lib/python3.10/importlib/__init__.py", line 126, in import_module                                                               
return _bootstrap._gcd_import(name[level:], package, level)                     
File "<frozen importlib._bootstrap>", line 1050, in _gcd_import                   
File "<frozen importlib._bootstrap>", line 1027, in _find_and_load                
File "<frozen importlib._bootstrap>", line 992, in _find_and_load_unlocked        
File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed      
File "<frozen importlib._bootstrap>", line 1050, in _gcd_import                   
File "<frozen importlib._bootstrap>", line 1027, in _find_and_load                
File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked       
File "<frozen importlib._bootstrap>", line 688, in _load_unlocked                 
File "<frozen importlib._bootstrap_external>", line 883, in exec_module           
File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed      
File "/data/data/com.termux/files/usr/lib/python3.10/site-packages/anime_downloader/__init__.py", line 1, in <module>                                                 
from anime_downloader.sites import get_anime_class                              
File "/data/data/com.termux/files/usr/lib/python3.10/site-packages/anime_downloader/sites/__init__.py", line 2, in <module>                                           
from .anime import Anime                                                        
File "/data/data/com.termux/files/usr/lib/python3.10/site-packages/anime_downloader/sites/anime.py", line 10, in <module>                                             
from anime_downloader import util                                               
File "/data/data/com.termux/files/usr/lib/python3.10/site-packages/anime_downloader/util.py", line 23, in <module>                                                    
from anime_downloader import session                                            
File "/data/data/com.termux/files/usr/lib/python3.10/site-packages/anime_downloader/session.py", line 5, in <module>                                                  
import requests_cache                                                           
File "/data/data/com.termux/files/usr/lib/python3.10/site-packages/requests_cache/__init__.py", line 43, in <module>                                                  
from .backends import *                                                         
File "/data/data/com.termux/files/usr/lib/python3.10/site-packages/requests_cache/backends/__init__.py", line 8, in <module>                                          
from .base import BaseCache, BaseStorage                                        
File "/data/data/com.termux/files/usr/lib/python3.10/site-packages/requests_cache/backends/base.py", line 18, in <module>                                             
from ..serializers import init_serializer                                       
File "/data/data/com.termux/files/usr/lib/python3.10/site-packages/requests_cache/serializers/__init__.py", line 6, in <module>                                       
from .preconf import (                                                          
File "/data/data/com.termux/files/usr/lib/python3.10/site-packages/requests_cache/serializers/preconf.py", line 26, in <module>                                       
base_stage = CattrStage()  #: Base stage for all serializer pipelines           
File "/data/data/com.termux/files/usr/lib/python3.10/site-packages/requests_cache/serializers/cattrs.py", line 32, in __init__                                        
self.converter = init_converter(factory)                                        
File "/data/data/com.termux/files/usr/lib/python3.10/site-packages/requests_cache/serializers/cattrs.py", line 67, in init_converter                                  
converter.register_structure_hook(                                              
File "/data/data/com.termux/files/usr/lib/python3.10/site-packages/cattr/converters.py", line 269, in register_structure_hook                                         
self._structure_func.register_cls_list([(cl, func)])                            
File "/data/data/com.termux/files/usr/lib/python3.10/site-packages/cattr/dispatch.py", line 57, in register_cls_list                                                  
self._single_dispatch.register(cls, handler)                                    
File "/data/data/com.termux/files/usr/lib/python3.10/functools.py", line 856, in register                                                                             
raise 
TypeError(                                                              TypeError: Invalid first argument to `register()`. ForwardRef('CachedResponse') is not a class.