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Chris Tate
a538ff42f0
lastIndexOf with a needle of the element type read every non-hole index as the element type. An undefined or foreign element written through a dynamic view (or a hole that toSorted turned into undefined) has no element-typed payload, so the read aborted with "array index N is undefined". The search now reads an index only when it holds a value, and skips undefined and foreign elements, as Node's strict equality does for a string or number needle.