> Le 5 août 2018 à 01:43, Michael Theriot <michael.lee.ther...@gmail.com> 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
_______________________________________________ es-discuss mailing list es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss
