I think as long as there's a test case for something like
```
@dataclass
class Node:
global_node: ClassVar[Node | None]
left: InitVar[Node | None]
right: InitVar[None | None]
```
the bug https://bugs.python.org/issue33453 and the current implementation
https://github.com/python/cpython/blob/bfc2d5a5c4550ab3a2fadeb9459b4bd948ff61a2/Lib/dataclasses.py#L658-L714
shows this is a tricky problem
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