diff --git a/scrapy/_classutilities.py b/scrapy/_classutilities.py
index ee58ea62f..3545ba7d0 100644
--- a/scrapy/_classutilities.py
+++ b/scrapy/_classutilities.py
@@ -3,7 +3,7 @@
 # https://github.com/david-salac/classutilities/blob/a6e4a86331936d432afaa454ed4c963528165a61/src/classutilities/classproperty.py
 
 # Allows creating a class level property
-from typing import Any, Callable
+from typing import Any, Callable, Optional, Union
 
 
 class ClassPropertyContainer:
@@ -21,7 +21,7 @@ class ClassPropertyContainer:
         self.prop_get: Any = prop_get
         self.prop_set: Any = prop_set
 
-    def __get__(self, obj: Any, cls: type = None) -> Callable:
+    def __get__(self, obj: Any, cls: Optional[type] = None) -> Callable:
         """
         Get the property getter.
         :param obj: Instance of the class.
@@ -46,7 +46,9 @@ class ClassPropertyContainer:
             _type = obj
         return self.prop_set.__get__(obj, _type)(value)
 
-    def setter(self, func: Callable) -> "ClassPropertyContainer":
+    def setter(
+        self, func: Union[Callable, classmethod, staticmethod]
+    ) -> "ClassPropertyContainer":
         """
         Allows creating setter in a property like way.
         :param func: Getter function.
diff --git a/scrapy/core/scraper.py b/scrapy/core/scraper.py
index 02ab8d3e4..a5d392870 100644
--- a/scrapy/core/scraper.py
+++ b/scrapy/core/scraper.py
@@ -85,7 +85,7 @@ class Slot(ClassPropertiesMixin):
         )
         return cls._MIN_RESPONSE_SIZE
 
-    @MIN_RESPONSE_SIZE.setter
+    @MIN_RESPONSE_SIZE.setter  # type: ignore[no-redef]
     def MIN_RESPONSE_SIZE(cls, value):
         warn(
             "scrapy.core.scraper.Slot.MIN_RESPONSE_SIZE is deprecated.",
@@ -93,7 +93,7 @@ class Slot(ClassPropertiesMixin):
         )
         cls._MIN_RESPONSE_SIZE = value
 
-    def __init__(self, max_active_size: int = _UNSET):
+    def __init__(self, max_active_size: Any = _UNSET):
         if max_active_size is not _UNSET:
             warn(
                 (