All value types. e.g. `fn f(…) -> Key`. Then `let k = f(…);` for local var, or construct struct w/ a `Key` field, or "box" it into the heap.
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All value types. e.g. `fn f(…) -> Key`. Then `let k = f(…);` for local var, or construct struct w/ a `Key` field, or "box" it into the heap.