If I define a setter for Array.prototype[0], does [].push invoke that setter?
Test code:
<!doctype html><html><body>
<script>
Object.defineProperty(
Array.prototype, 0,
{ get : function() { alert('get 0'); return this.zero; },
set : function(v) { alert('set 0 ' + v); this.zero = v; },
enumerable : true,
configurable : false });
var a = [];
alert('before push a[0] = ' + a[0]);
a.push(44);
alert('after push a[0] = ' + a[0]);
</script>
</body></html>
On all the browsers I've tried so far, the setter doesn't get invoked.
However, it looks to me like the ES5.1 spec says the setter should get invoked:
15.4.4.7 says push() invokes the [[Put]] internal method
8.12.5 says [[Put]] tries to use an inherited property descriptor if
there isn't an own property descriptor.
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