This week's book giveaway is in the Java 9 forum. We're giving away four copies of Java 9 Modularity: Patterns and Practices for Developing Maintainable Applications and have Sander Mak & Paul Bakker on-line! See this thread for details.
Personal choice, the framework is trying to be 'helpful' by supporting various different syntax options. I personally prefer named options to question marks for less ambiguity, although either is fine.