Comment #1 on issue 4128 by [email protected]: TypedArray methods
should use InternalArray, not Array, as an accumulator
https://code.google.com/p/v8/issues/detail?id=4128
I have a patch working to use InternalArray rather than GlobalArray in
Array.from (I think that's the only remaining case) but I'm at a loss to
test it. Your setter wouldn't be called because Array.from uses
[[DefineOwnProperty]], not [[Put]]. My other idea would be to do something
with holes to observe the proto chain lookup to Array.prototype, but
Array.from doesn't preserve holes, so that wouldn't be visible. Array.from
does do a [[Put]] on the 'length' property, but of course that property is
not configurable so I can't replace it with a setter. Any other ideas?
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