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Revisiting this I found some parts confusing, so I've tweaked it a bit to clarify.
The
Assert: _openIters_ is not empty.
step won't be true until after #20 lands.An alternative to replacing elements of
_iters_
withnull
and tracking_openIters_
as separate list could be to just rely on the[[Done]]
field of Iterator Records. That would require updating IteratorCloseAll to filter out the[[Done]]: true
ones, though.