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Chris Tate
98006639b7
An element write of a `T | undefined` binding holds a computed index in a temporary ahead of its two stores, which then read the receiver after the index. When the index can rebind the receiver (`a[(a = b, 0)] = u`), the write now keeps reading the receiver first, so it stores into the array the receiver held before the index ran. The key conversion of a union index (a sequence that declares a temporary and may read the constant "undefined" key) no longer counts as running other code, so such an index is still held.