Document heap allocation location guarantee
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@ -3909,6 +3909,9 @@ The _heap_ is a general term that describes boxes. The lifetime of an
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allocation in the heap depends on the lifetime of the box values pointing to
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it. Since box values may themselves be passed in and out of frames, or stored
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in the heap, heap allocations may outlive the frame they are allocated within.
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An allocation in the heap is guaranteed to reside at a single location in the
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heap for the whole lifetime of the allocation - it will never be relocated as
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a result of moving a box value.
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### Memory ownership
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