Sparse append only vec

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i found AppendOnlyVec, which nearly covers my usecase, except for the fact that i sometimes want insert items past the end, and fill in the slot between them later..

semantically, what i want is an insert-only integer keyed map, but i think an insert-only sparse vec would be more performant...

2

How about AppendOnlyVec<OnceCell<T>>?

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