The Tor Browser / file revision

 // Frame.prototype.arguments with primitive values

 var g = newGlobal();

 g.args = null;

 var dbg = new Debugger(g);

 var hits;

 var v;

 dbg.onDebuggerStatement = function (frame) {

     hits++;

     var args = frame.arguments;

     assertEq(args instanceof Array, true);

     assertEq(Array.isArray(args), false);

     assertEq(args, frame.arguments);

     assertEq(args.length, g.args.length);

     for (var i = 0; i < args.length; i++)

         assertEq(args[i], g.args[i]);

 };

 // no formal parameters

 g.eval("function f() { debugger; }");

 hits = 0;

 g.eval("args = []; f();");

 g.eval("this.f();");

 g.eval("args = ['hello', 3.14, true, false, null, undefined]; f.apply(undefined, args);");

 g.eval("f('hello', 3.14, true, false, null, undefined);");

 g.eval("args = [-0, NaN, -1/0]; this.f(-0, NaN, -1/0);");

 assertEq(hits, 5);

 // with formal parameters

 g.eval("function f(a, b) { debugger; }");

 hits = 0;

 g.eval("args = []; f();");

 g.eval("this.f();");

 g.eval("args = ['a', 'b']; f('a', 'b');");

 g.eval("this.f('a', 'b');");

 g.eval("f.bind(null, 'a')('b');");

 assertEq(hits, 5);