super bindings in object literals' concise methods

I don't claim to fully understand what's going on here, but:

``` js
var o = {
__proto__: Array.prototype,
foo() {
super.push(true);
},
}
o.foo();
o.foo();
o; // {0:true,1:true,length:2}
```

Without the browser-specific `__proto__`, `super` seems restricted to just Object.prototype methods:

``` js
var o = {
hasOwnProperty(a) {
return !super.hasOwnProperty(a);
},
foo: true,
};
o.hasOwnProperty('foo'); // false
o.hasOwnProperty('bar'); // true
```

If anyone has a more concrete explanation, do tell.