H37 let a projection-only local or argument read an optional array element through a private stack box that borrowed the element when the array was proven to outlive it. Nullable-union reads lost that borrow and retained/released each element (records-sort's comparator keys). Optional array reads now run over every union, and emitLocalArrayRead stores the borrowed element pointer, or one owned reference released from the same slot, instead of a box.
Malte Ubl
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