A familiar idiom from `System.out` is

System.out.println("Some stuff:");
System.out.println(stuff);
System.out.println(); // <--- a blank line here!
System.out.println("Some more stuff:");

In the new `IO` preview class (which is possibly moving from java.io to java.lang?), the no-arg `println` isn't there, so some existing code won't convert over cleanly until users change these calls to `println("")`.

I see no disadvantage to this overload, and it smooths transition and also fits within existing idiom/expectations.