Both usages are perfectly fine. It is unlikely that I'll convince you with any argument here, so I'll just recommend that you check out a reference on English

Both usages are perfectly fine. It is unlikely that I'll convince you with any argument here, so I'll just recommend that you check out a reference on English usage. My favorite is Merriam-Webster's Dictionary of English Usage. P.S. Clojure is great and I am enjoying this book so far. Edit: Aha, I saw in a later response of yours that you're already aware that both usages are considered fine and just have a strong personal opinion. Carry on.