Type annotation for parametrize ids should allow HIDDEN_PARAM

[jonathan-conder]

Current the ids keyword argument of pytest.mark.parametrize is an Iterable[None | str | float | int | bool]. It should also allow pytest.HIDDEN_PARAM (similar to pytest.param(id=...)).

$ pip list
Package           Version                 Editable project location
----------------- ----------------------- -------------------------
iniconfig         2.3.0
librt             0.8.1
mypy              1.19.1
mypy_extensions   1.1.0
packaging         26.0
pathspec          1.0.4
pip               24.0
pluggy            1.6.0
Pygments          2.19.2
pytest            9.1.0.dev216+g9fd1eebd8 /home/user/pytest
typing_extensions 4.15.0

$ pytest --version
pytest 9.1.0.dev216+g9fd1eebd8

$ cat example.py
from __future__ import annotations

import pytest


@pytest.mark.parametrize("a", [1], ids=[pytest.HIDDEN_PARAM])
def test_a(a: int) -> None:
    assert a == 1

$ mypy example.py 
example.py:6: error: List item 0 has incompatible type "_HiddenParam"; expected "str | float | int | None"  [list-item]
Found 1 error in 1 file (checked 1 source file)

[V1SHAL421]

I will work on this!