V8 have bug.
Reproduction code:
Error.prepareStackTrace = ()=>{throw 123}
Object.getOwnPropertyDescriptor(new Error, 'stack') // throws 123
It should be probably filled on V8 bug tracker.
On 10/01/17 21:14, Isiah Meadows wrote:
>
> To clarify, what engine has the bug here? I've lost that context.
>
>
> On Tue, Jan 10, 2017, 14:54 Michał Wadas <[email protected]
> <mailto:[email protected]>> wrote:
>
> Actually here spec repeats itself because...
>
> *A conforming implementation of ECMAScript may provide additional*
> types, values, objects, *properties*, and functions beyond those
> described in this specification. *In particular, a conforming
> implementation of ECMAScript may provide properties not described
> in this specification, and values for those properties, for
> objects that are described in this specification*.
>
> So implementation is explicitly allowed to add new properties on
> objects.
>
> Though, internal methods and internal slots are not properties:
>
> Internal slots correspond to internal state that is associated
> with objects and used by various ECMAScript specification
> algorithms. *Internal slots are not object properties* and they
> are not inherited.
>
> So it's spec violation to have custom [[GetOwnProperty]]
> implementation on ordinary objects.
>
> On 10/01/17 20:36, Boris Zbarsky wrote:
>> On 1/10/17 2:31 PM, Michał Wadas wrote:
>>> Implementations are allowed to extend objects. Otherwise
>>> presence of
>>> global/console/// would violate spec...
>>
>> http://www.ecma-international.org/ecma-262/6.0/#sec-global-object
>> explicitly says that the global object may have additional
>> properties, so global .console is clearly not a spec violation.
>>
>> -Boris
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>
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