Right now this corner case is not tested:

```python
class Some:
    x: int = None

import typing
assert typing.get_type_hints(Some) == {'x': int}
```

Notice that we don't add implicit `Optional` type to `x`. This is different for function arguments that will have `Optional` added.

I think it is a good idea to add a test for this. Espeically given that we can change function's behavior.

Context:
- https://bugs.python.org/issue46195
- https://github.com/python/cpython/pull/30304

I will send a PR today :)

New changeset 1de60155d5d01be2924e72fb68dd13d4fd00acd7 by Nikita Sobolev in branch 'main':
bpo-46345: Add a test case for implicit `Optional` class attribute (GH-30535)
https://github.com/python/cpython/commit/1de60155d5d01be2924e72fb68dd13d4fd00acd7

New changeset a468866a67d83a24e3a3c3a0070129773d28bbd9 by Miss Islington (bot) in branch '3.10':
bpo-46345: Add a test case for implicit `Optional` class attribute (GH-30535)
https://github.com/python/cpython/commit/a468866a67d83a24e3a3c3a0070129773d28bbd9

New changeset d9101c4e49dc29f21319493818130ad5468402a2 by Miss Islington (bot) in branch '3.9':
bpo-46345: Add a test case for implicit `Optional` class attribute (GH-30535)
https://github.com/python/cpython/commit/d9101c4e49dc29f21319493818130ad5468402a2

When I take a look at previous PRs, most of adding test cases were not backported.
The backported cases were triggered by bug issues.
But let's pass this case as an exceptional case.

Wasn’t the fix for it also backported?

(Weird that the test wasn’t part of the fix.)

@gvanrossum

Ah okay, Looks like bpo-46195 is the root of this issue.
In this case, backporting is reasonable.

@sobolevn

Do you want to close it?
Cleaning up the issue is one of the duties of triage members :)