Call for feedback -- enhanced switch

[Brian Goetz]

We would like to promote enhanced switch to a permanent feature in Java 13.  So far, the only change we are anticipating is:

    - change “break value” to “break-with value”.  

This is the time for people to try it out on their codebases (there’s even refactoring support in IDEA!) and provide feedback on what works, what doesn’t, and what was surprising.