GeezerVison

…places a dataclass, make the original class collectible (pythonGH-136893) (python#136960)"

This reverts commit 6e1b31b.

Modifying the `__dict__` is likely to cause crashes

…ass, make the original class collectible (pythonGH-136893) (python#136960)

pythongh-135228: When @DataClass(slots=True) replaces a dataclass, make the original class collectible (pythonGH-136893)

An interesting hack, but more localized in scope than pythonGH-135230.

This may be a breaking change if people intentionally keep the original class around
when using `@dataclass(slots=True)`, and then use `__dict__` or `__weakref__` on the
original class.
(cherry picked from commit 46cbdf9)

Co-authored-by: Jelle Zijlstra <[email protected]>
Co-authored-by: Alyssa Coghlan <[email protected]>