michael@0: 
michael@0: var g = newGlobal("same-compartment");
michael@0: g.eval("this.f = function(a) {" +
michael@0:        "assertEq(a instanceof Array, false);" +
michael@0:        "a = Array.prototype.slice.call(a);" +
michael@0:        "assertEq(a instanceof Array, true); }");
michael@0: g.f([1, 2, 3]);
michael@0: 
michael@0: var g2 = newGlobal();
michael@0: g2.a = g2.Array(10);
michael@0: assertEq(g2.a instanceof Array, false);
michael@0: g2.a = Array.prototype.slice(g2.a);
michael@0: assertEq(g2.a instanceof Array, true);