* SUMMARY Descriptor of Function.arguments is inconsistent. Sometimes it is a value, sometimes it is a getter/setter. This doesn't seem expected. js> Object.getOwnPropertyDescriptor(function(){}, "arguments") < {value: null, writable: false, enumerable: false, configurable: false} js> Object.getOwnPropertyDescriptor(function(){}.bind(this), "arguments") < {get: function, set: function, enumerable: false, configurable: false} Also, it is possible that "arguments" should not be on the instance but actually on Function.prototype.
Note, this affects Web Inspector. We look at descriptors when expanding objects. When the "arguments" property getter is invoked outside of an invocation of the function it produces an error: js> (function(){}).bind(this).arguments < TypeError: Type error So when inspector tries to show the value of "arguments" in object expansion, we encounter the errors. It is a bit unfortunate and we may want to workaround this. js> dir(function(){}.bind(this)) < function () { [native code] } arguments: [Exception: TypeError: Type error] caller: [Exception: TypeError: Type error] length: 0 name: "" __proto__: function () {