Bug 151812 – Numeric properties of an object will not use accessors defined on the object's prototype

• Status: RESOLVED
• Resolution: CONFIGURATION CHANGED
• Component: JavaScriptCore

[Daniel Freedman]

Reproduction:

var proto = Object.create(null);
Object.defineProperty(proto, '0', {
  get: function(){console.log('get')},
  set: function(){console.log('set')}
});
var o = Object.create(proto);
o[0] = 3;
o[0] === undefined

Expected:
Console prints 'set', 'get', and 'true', as o[0] === undefined.

Actual:
Console prints 'false', as o[0] === 3


Chrome, Firefox, and IE/Edge will show the expected behavior.

[Radar WebKit Bug Importer]

<rdar://problem/28263024>

[David Kilzer (:ddkilzer)]

According to this thread on Twitter, the bug is already fixed in Safari 10:

<https://twitter.com/JakeDChampion/status/775293346608713728>

[David Kilzer (:ddkilzer)]

Not sure when this was fixed, so RESOLVED/CONFIG CHANGED.