[issue45156] mock.seal has infinite recursion with int class attributes

[Nikita Sobolev]

Nikita Sobolev <mail at sobolevn.me> added the comment:

I've proposed a solution, based on the assumption that we don't need to recurse into `_SpecState` props:

```
if isinstance(m._mock_children.get(attr), _SpecState):
   continue
```

It seems like a simple and reasonable thing to do.
Link: https://github.com/python/cpython/pull/28300

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