It seems like the following should be caught or at least be added to the documented limitations:

from enum import Enum
from typing import Optional


class Letter(Enum):
    """ok."""

    A = "A"


class CatchMe:
    """class."""


def f(
    letter: Letter = None,  # <--- should be caught
    word: Optional[str] = None,
    catch: CatchMe = None,  # <--- should be caught
) -> None:
    """Doc."""

• List of keywords you searched for before creating this issue: RUF013
• A minimal code snippet that reproduces the bug: https://play.ruff.rs/afaf262e-0615-4732-83aa-4cc32af930c2
• The command you invoked: ruff check file.py --select RUF013
• The current Ruff settings: in the snippet.
• The current Ruff version: 0.7.1