I have to respectfully disagree, I have built a lot of JavaScript based application, some of them huge code bases for the like of IBM and not once have I had to

I have to respectfully disagree, I have built a lot of JavaScript based application, some of them huge code bases for the like of IBM and not once have I had to resort to using the arguments object. I consider myself to be an expert, but should I ever need to use it, I would look up the API because it is not a feature used in the mainstream of development. Understanding technical nuances of a languadge does not make a developer an expert, delivering a clean, maintainable and elegant code base to production to generate revenue does. Now my opinion would differ if it was someone hired to actually work on V8 or one of the JavaScript run-times but requiring mastery of nuances of a languadge when they will be used rarely if at all seems to me to be a filter that can eliminate good candidates in favor of trivia knowledge. Trivia can be looked up, delivery and maintainability cannot, these questions favor trivia over delivery.