toString/equals/hashCode implemented using method handles

Brian Goetz brian.goetz at
Thu Jun 21 20:53:57 UTC 2018

> As discussed during our today meeting,
> here is an implementation of toString, equals and hashCode that can be used as default implementation of these methods for value types.

There is also similar code in the Amber repo for records.  At some 
point, we should have a bake-off and pick the best implementation; 
surely we should only have one.

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