>>6I didn't say they were equivalent, I said it was also valid.
"Something" certainly can be used in questions. Have you never heard any of the following constructions used?
Is there something I can do for you?
Did he own something of value?
I'll grant you it's less common for "something" to be used in negation. There really *is* no real distinguishing something and anything. It isn't a definitive "use something here, anything there". The difference depends on context. Anything is more infinite, while something is more limited.
Besides, I will always takes a descriptivist approach.