Weird behavior with JSON builtin

[zebp]

The JSON built in currently has a few issues that are thankfully easy to fix.Currently the JSON.stringify and JSON.parse are undefined and expect you to specify the JSON builtin's prototype.

The second issue is that the function JSON.stringify (accessed through JSON.prototype.stringify) returns unexpected output.

Example:

JSON.prototype.stringify({ number: 1 }) // Currently evaluates to "{ "extensible": true }"

This issue seems to be caused by this line using the internal_slots instead of the object's properties.

If you want I could submit a PR to fix these issues.

[jasonwilliams]

Yes please @vlakreeh i don't know why its iterating through internal slots there instead of properties, seems odd. Looks like a change i made but not sure why i did that.
I think the JSON builtin needs some tests similar to the others

And yes you can just point prototype to Object.prototype

https://github.com/jasonwilliams/boa/blob/master/boa/src/builtins/json.rs#L33 can also go as its ordinary by default

[Razican]

I think that #325 solved the first issue described here, and the other issue seems to be solved. If I run:

JSON.stringify({ number: 1 })

I get:

{"number":1}

And, in a more complex scenario:

let a = JSON.stringify({ number: 1 });
let b = JSON.parse(a);
b.number;

I get 1.

So I'm closing this issue.