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#1582 — 15.4.2.4 Array.from mapping is always set to true


4. If mapfn is undefined, then let mapping be true.

Later |mapping| is used to determine if the value will be a mappedValue result from calling mapfn, which means #4 should actually be:


4. If mapfn is undefined, then let mapping be false.


fixed in rev17 editor's draft


fixed in rev17, August 23, 2013 draft