Use `ParamSpec` to annotate looping_call

synapse/util/__init__.py

@@ -20,6 +20,7 @@ from typing import Any, Callable, Dict, Generator, Optional
 import attr
 from frozendict import frozendict
 from matrix_common.versionstring import get_distribution_version_string
+from typing_extensions import ParamSpec
 
 from twisted.internet import defer, task
 from twisted.internet.defer import Deferred
@@ -82,6 +83,9 @@ def unwrapFirstError(failure: Failure) -> Failure:
     return failure.value.subFailure  # type: ignore[union-attr]  # Issue in Twisted's annotations
 
 
+P = ParamSpec("P")
+
+
 @attr.s(slots=True)
 class Clock:
     """
@@ -110,7 +114,7 @@ class Clock:
         return int(self.time() * 1000)
 
     def looping_call(
-        self, f: Callable, msec: float, *args: Any, **kwargs: Any
+        self, f: Callable[P, object], msec: float, *args: P.args, **kwargs: P.kwargs
     ) -> LoopingCall:
         """Call a function repeatedly.
 

synapse/util/caches/lrucache.py

@@ -109,7 +109,7 @@ GLOBAL_ROOT = ListNode["_Node"].create_root_node()
 
 @wrap_as_background_process("LruCache._expire_old_entries")
 async def _expire_old_entries(
-    clock: Clock, expiry_seconds: int, autotune_config: Optional[dict]
+    clock: Clock, expiry_seconds: float, autotune_config: Optional[dict]
 ) -> None:
     """Walks the global cache list to find cache entries that haven't been
     accessed in the given number of seconds, or if a given memory threshold has been breached.