> Le 5 août 2018 à 05:07, Claude Pache <[email protected]> a écrit : > > > >> Le 5 août 2018 à 04:50, Claude Pache <[email protected] >> <mailto:[email protected]>> a écrit : >> >> >> >>> Le 5 août 2018 à 01:43, Michael Theriot <[email protected] >>> <mailto:[email protected]>> a écrit : >>> >>> Try `Number.prototype.valueOf.call(obj)`: it will throw a TypeError if and >>> only if `obj` has no [[NumberData]] internal slot. Ditto for String, >>> Boolean and Symbol. >>> >>> I already mention this and demonstrate why it is not sufficient in my >>> example. >>> >>> Reiterated plainly: >>> ```js >>> JSON.stringify(Reflect.construct(Number, [], Number)); // "0" >>> JSON.stringify(Reflect.construct(Number, [], String)); // TypeError >>> JSON.stringify(Reflect.construct(Number, [], Object)); // null >>> ``` >> >> Per spec, the three expressions should produce `"0"`, as the three objects >> have a [[NumberData]] internal slot (step 4 of [1]). I guess there is some >> discrepancy between implementation and spec for those exotic edge cases? >> >> [1]: https://tc39.github.io/ecma262/#sec-serializejsonproperty >> <https://tc39.github.io/ecma262/#sec-serializejsonproperty> >> >> —Claude >> > > I see that there is a difference in this algorithm between the current spec > and ES 2015 for that particular step. From my tests, current stable Firefox > and Safari (other browsers not tested) still follow the old algorithm. > > —Claude > > Nevrmind, forget the previous message. The algorithm does indeed somewhat strange here.
—Claude
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