Could we make %ArrayPrototype%'s [[DefineOwnProperty]] throw or no-op for numeric keys?

Axel Rauschmayer axel at
Thu Apr 16 08:06:53 UTC 2015

> As long as we have mutable __proto__ in the language that is not going to help. And even then, you'd have to restrict the whole prototype chain, including Object.prototype.
> AFAICT, the only working solution is to change the behaviour of [[Get]] on arrays, such that they do not consider inherited numeric properties -- like typed arrays, or what we propose for strong mode arrays.

Would it help if one introduced new methods `get()` and `set()` for accessing array elements? They could be overridden, but that seems like a simpler, more optimizable check.

Dr. Axel Rauschmayer
axel at

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