diff --git a/fastapi_cache/decorator.py b/fastapi_cache/decorator.py
index be50d30..8a5e0a6 100644
--- a/fastapi_cache/decorator.py
+++ b/fastapi_cache/decorator.py
@@ -1,7 +1,8 @@
 import inspect
 import sys
 from functools import wraps
-from typing import Any, Awaitable, Callable, Optional, TypeVar
+from typing import Any, Awaitable, Callable, Optional, TypeVar, Type
+
 if sys.version_info >= (3, 10):
     from typing import ParamSpec
 else:
@@ -21,7 +22,7 @@ R = TypeVar("R")
 
 def cache(
     expire: Optional[int] = None,
-    coder: Optional[Coder] = None,
+    coder: Optional[Type[Coder]] = None,
     key_builder: Optional[Callable[..., Any]] = None,
     namespace: Optional[str] = "",
 ) -> Callable[[Callable[P, Awaitable[R]]], Callable[P, Awaitable[R]]]:
@@ -92,10 +93,9 @@ def cache(
                     # see above why we have to await even although caller also awaits.
                     return await run_in_threadpool(func, *args, **kwargs)
 
-
             copy_kwargs = kwargs.copy()
-            request = copy_kwargs.pop("request", None)
-            response = copy_kwargs.pop("response", None)
+            request: Optional[Request] = copy_kwargs.pop("request", None)
+            response: Optional[Response] = copy_kwargs.pop("response", None)
             if (
                 request and request.headers.get("Cache-Control") == "no-store"
             ) or not FastAPICache.get_enable():