Refs #34445 -- Fixed string-casting of non-string lazy objects when value may be bytes.

If the result type is bytes, then calling bytes() on it does nothing.

If the result type is not bytes, we should not cast to bytes, just
because the return value may be bytes.

django/utils/functional.py

@@ -144,10 +144,7 @@ def lazy(func, *resultclasses):
             return bytes(func(*self.__args, **self.__kw))
 
         def __cast(self):
-            if self._delegate_bytes:
-                return self.__bytes_cast()
-            else:
-                return func(*self.__args, **self.__kw)
+            return func(*self.__args, **self.__kw)
 
         def __str__(self):
             # object defines __str__(), so __prepare_class__() won't overload

tests/utils_tests/test_functional.py

@@ -242,6 +242,10 @@ class FunctionalTests(SimpleTestCase):
         lazy_value = lazy(lambda: [1], str, list)()
         self.assertEqual(str(lazy_value), "[1]")
 
+    def test_lazy_str_cast_mixed_bytes_result_types(self):
+        lazy_value = lazy(lambda: [1], bytes, list)()
+        self.assertEqual(str(lazy_value), "[1]")
+
     def test_classproperty_getter(self):
         class Foo:
             foo_attr = 123