Use more precise callable doctypes where possible

Author: lagru

src/docstub/_concurrency.py

@@ -56,7 +56,7 @@ class LoggingProcessExecutor:
 
     max_workers: int | None = None
     logging_handlers: tuple[logging.Handler, ...] = ()
-    initializer: Callable | None = None
+    initializer: Callable[..., None] | None = None
     initargs: tuple | None = ()
 
     @staticmethod
@@ -67,7 +67,7 @@ def _initialize_worker(queue, worker_log_level, initializer, initargs):
         ----------
         queue : multiprocessing.Queue
         worker_log_level : int
-        initializer : Callable
+        initializer : Callable[..., None]
         initargs : tuple of Any
         """
         queue_handler = logging.handlers.QueueHandler(queue)

src/docstub/_utils.py

@@ -71,11 +71,11 @@ def _resolve_path_before_caching(func):
 
     Parameters
     ----------
-    func : Callable
+    func : Callable[[Path], str]
 
     Returns
     -------
-    wrapped : Callable
+    wrapped : Callable[[Path], str]
     """
 
     @wraps(func)