Comment #2 on issue 705 by [email protected]: Non-enumerable property
fails to shadow inherited enumerable property from for-in
http://code.google.com/p/v8/issues/detail?id=705
The bug is related to the way we find objects to add in the for-in-loop.
The actual
value of enumerable (on derived['x]) is actually set to false, this can be
confirmed
by doing:
var base = {x:10};
var derived = Object.create(base, {x: {value: 9, enumerable: false}});
var desc = Object.getOwnPropertyDescriptor(derived, "x");
for(var v in desc)
print(v + ": " + desc[v]);
which gives:
value: 9
writable: false
enumerable: false
configurable: false
In for-in-loop code that finds the elements to add we currently simply
discard a
value if it is not enumerable. Because we do a bottom up search for
properties to add
(starting at the actual object and traversing up the prototype chain) we
will add the
property to the result when processing the prototype of derived(base) even
though we
did not add it when processing derived.
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