Fixes for memory (#2)

* Fix: call() and __call__() should return _T

* Fix: allow missing argument for memory.cache

* Fix static analyzer

src/joblib-stubs/memory.pyi

@@ -143,14 +143,12 @@ class MemorizedFunc(Logger, Generic[_P, _T]):
     def call_and_shelve(
         self, *args: _P.args, **kwargs: _P.kwargs
     ) -> MemorizedResult[_T] | NotMemorizedResult[_T]: ...
-    def __call__(
-        self, *args: _P.args, **kwargs: _P.kwargs
-    ) -> MemorizedResult[_T] | NotMemorizedResult[_T]: ...
+    def __call__(self, *args: _P.args, **kwargs: _P.kwargs) -> _T: ...
     def check_call_in_cache(self, *args: _P.args, **kwargs: _P.kwargs) -> bool: ...
     def clear(self, warn: bool = ...) -> None: ...
     def call(
         self, *args: _P.args, **kwargs: _P.kwargs
-    ) -> tuple[MemorizedResult[_T] | NotMemorizedResult[_T], dict[str, Any]]: ...
+    ) -> tuple[_T, dict[str, Any]]: ...
 
 class AsyncMemorizedFunc(MemorizedFunc[_P, AnyAwaitable[_T]], Generic[_P, _T]):
     func: AnyAwaitableCallable[_P, _T]  # pyright: ignore[reportIncompatibleMethodOverride]
@@ -166,15 +164,13 @@ class AsyncMemorizedFunc(MemorizedFunc[_P, AnyAwaitable[_T]], Generic[_P, _T]):
         timestamp: float | None = ...,
         cache_validation_callback: Callable[..., Any] | None = ...,
     ) -> None: ...
-    async def __call__(  # type: ignore[override]
-        self, *args: _P.args, **kwargs: _P.kwargs
-    ) -> MemorizedResult[_T] | NotMemorizedResult[_T]: ...
+    async def __call__(self, *args: _P.args, **kwargs: _P.kwargs) -> _T: ...
     async def call_and_shelve(  # type: ignore[override]
         self, *args: _P.args, **kwargs: _P.kwargs
     ) -> MemorizedResult[_T] | NotMemorizedResult[_T]: ...
     async def call(  # type: ignore[override]
         self, *args: _P.args, **kwargs: _P.kwargs
-    ) -> tuple[MemorizedResult[_T] | NotMemorizedResult[_T], dict[str, Any]]: ...
+    ) -> tuple[_T, dict[str, Any]]: ...
 
 class Memory(Logger):
     mmap_mode: MmapMode
@@ -198,7 +194,7 @@ class Memory(Logger):
     @overload
     def cache(
         self,
-        func: None,
+        func: None = ...,
         ignore: list[str] | None = ...,
         verbose: int | None = ...,
         mmap_mode: MmapMode | bool = ...,
@@ -234,11 +230,11 @@ class Memory(Logger):
     @overload
     def eval(
         self, func: AnyAwaitableCallable[_P, _T], *args: _P.args, **kwargs: _P.kwargs
-    ) -> Coroutine[Any, Any, _T | NotMemorizedResult[_T] | MemorizedResult[_T]]: ...
+    ) -> Coroutine[Any, Any, _T]: ...
     @overload
     def eval(
         self, func: Callable[_P, _T], *args: _P.args, **kwargs: _P.kwargs
-    ) -> _T | NotMemorizedResult[_T] | MemorizedResult[_T]: ...
+    ) -> _T: ...
 
 def expires_after(
     days: int = ...,