In Clojure it basically means "foo* is like foo, but somehow different, and you probably want foo". In other words, it means that the author of that code couldn't come up with a better name for the second function, so they just slapped a star on it.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…