FlatMapper

[Brian Goetz]

> Are we going to have a consistency issue with FlatMapper vs.
> Function?  For instance we have ToIntFunction, but not
> ToIntFlatMapper.  Instead we have FlatMapper.ToInt.


I think that's a function of where it lands, which is open for 
discussion.  Currently it is in java.util.stream, where the dominant 
convention is Foo.OfBar.  If we moved it to java.util.function, we'd 
"flatten" the namespace.

I currently lean towards JUS, since this does not seem as important a 
top-level type as Function, Predicate, or Supplier.  But such decisions 
often turn around to bite one.