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fixes https://github.com/nim-lang/Nim/issues/22619
It causes double free for closure iterators because cursor fields are
destroyed in the lifted destructors of `Env`.
Besides, according to the Nim manual
> In fact, cursor more generally prevents object
construction/destruction pairs and so can also be useful in other
contexts.
At least, destruction of cursor fields might cause troubles.
todo
- [x] tests
- [x] revert a certain old PR
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Co-authored-by: zerbina <100542850+zerbina@users.noreply.github.com>
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