> There was a SpiderMonkey bug1, and even a patch, for this for quite a while.
> The patch now landed and will be in Firefox 29.
>V8 got fixed last week too
>code.google.com/p/v8/issues/detail?id=3069
but according to spec, "forEach" should call callback with "-0":
var map = new Map();
map.set(-0, 'x');
map.forEach(function (value, key) {
alert(1 / key);
});
alert(map.get(0));
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