Handle Array prototype properties in standard operations #1426
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When an Array object's prototype is changed, disable the "dense only" optimization to ensure that prototype properties are considered by standard operations.
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When an Array object's prototype is changed, disable the "dense only" optimization to ensure that prototype properties are considered by standard operations.
This should fix #1319, although it doesn't fix any existing test262 tests, and it
does not necessarily fix every strange things about arrays and its prototype.