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This feels wrong. Specifically, doesn't laziness bite you in this scenario? If I make a stream that is realized over GC runs, I would expect that a node in an old generation could point to a realized data element from a newer generation. Why not?

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It does: "Nevertheless, implicit mutation of heap objects is rife at runtime, thanks to the implementation of lazy evaluation (which, we admit, is somewhat ironic)." says <https://www.microsoft.com/en-us/research/wp-content/uploads/...>

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