def astype(value: T, dtype: Type[T]) -> T:
    """Cast a value to the current floating point type.

    Args:
        value: The value to cast.
        dtype: The type to cast to.

    Returns:
        The value cast to the current floating point type.
    """
    out: T = types[dtype](value)
    return out

def set_precision(**kwargs: type) -> None:
    """Set the floating point type.

    Args:
        float: The floating point type to use.
        complex: The complex type to use.
    """
    types[float] = kwargs.get("float", types[float])
    types[complex] = kwargs.get("complex", types[complex])

@contextmanager
def precision(**kwargs: type) -> Iterator[None]:
    """Context manager for setting the floating point precision.

    Args:
        float: The floating point type to use.
        complex: The complex type to use.
    """
    old = {
        "float": types[float],
        "complex": types[complex],
    }
    set_precision(**kwargs)
    yield
    set_precision(**old)

@contextmanager
def single_precision() -> Iterator[None]:
    """Context manager for setting the floating point precision to single precision."""
    with precision(float=np.float32, complex=np.complex64):
        yield