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function NPList() {}
NPList.prototype = new Array;
var list = new NPList();
list.push('a');
var cut = list.splice(0, 1);
assertEq(cut[0], 'a');
assertEq(cut.length, 1);
assertEq(list.length, 0);
var desc = Object.getOwnPropertyDescriptor(list, "0");
assertEq(desc, undefined);
assertEq("0" in list, false);