On Aug 12, 2010, at 2:07 PM, Erik Arvidsson wrote:
> It seems like ES5 does not define the [[Enumerable]], [[Configurable]]
> nor [[Writable]] for the fields on Array.prototype and others like it.
It does, by specifying default values in the intro to Clause 15, last paragraph:
In every case, the length property of a built-in Function object described in
this clause has the attributes { [[Writable]]: false, [[Enumerable]]: false,
[[Configurable]]: false }. Every other property described in this clause has
the attributes { [[Writable]]: true, [[Enumerable]]: false, [[Configurable]]:
true } unless otherwise specified.
ES1-3 did likewise, IIRC.
> I spec'ed the attributes for all the methods to match ES+Reality. This
> means that the methods have {enumerable: false, configurable: true,
> writable: true}. This matches what JSC, V8, SpiderMonkey and IE9p4 do.
ES5 has your back ;-).
> In the future, it would be good if we could follow the existing
> semantics for the built-in natives.
Agreed.
/be
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