Proposed API for JEP 259: Stack-Walking API

[Brian Goetz]

>> IntToIntFunction => IntUnaryOperator.
>
> Ah that's the one!  You know I think that this is more than once that 
> I looked for, and didn't find, that interface.  Some kind of mental 
> blind spot I guess. :-)
>

We all look forward to when Valhalla will relegate all of these 
hand-specialized interfaces to the scrap heap, and we can just use 
Function<int,int>...