from typing import Callable, ParamSpec, TypeVar, Any, Dict

P = ParamSpec('P')
R = TypeVar('R')

def typed_function(func: Callable[P, R], signature_dict: Dict[str, Any]) -> Callable[P, R]:
    """
    Returns the function with its signature preserved using ParamSpec.

    The signature_dict is passed for potential future use or documentation,
    but is not currently used in the implementation.

    Args:
        func: The function whose signature is to be preserved.
        signature_dict: A dictionary describing the function's signature (not used).

    Returns:
        The original function, typed with ParamSpec to preserve its signature.
    """
    return func
