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 > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss
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