[4.0.x] Fixed #33361 -- Fixed Redis cache backend crash on booleans.

Backport of 2f33217ea2cad688040dd6044cdda946c62e5b65 from main

1 files changed, 7 insertions, 1 deletions

diff --git a/django/core/cache/backends/redis.py b/django/core/cache/backends/redis.py
index 16556b1ded..ec2fb06102 100644
--- a/django/core/cache/backends/redis.py
+++ b/django/core/cache/backends/redis.py
@@ -10,8 +10,14 @@ from django.utils.module_loading import import_string
 
 
 class RedisSerializer(PickleSerializer):
+    """
+    Similar to PickSerializer, except integers are serialized as native Redis
+    integers for better incr() and decr() atomicity.
+    """
     def dumps(self, obj):
-        if isinstance(obj, int):
+        # Only skip pickling for integers, a int subclasses as bool should be
+        # pickled.
+        if type(obj) is int:
             return obj
         return super().dumps(obj)