> On May 3, 2017, at 10:01 PM, Daniel Prager <daniel.a.pra...@gmail.com> wrote:
> Do you bet on the Formula I driver whose team includes the most safety 
> features? ;-)

Yes. He’s more like to survive and get across the goal line :)) 

> From a technical perspective I'm happy to not mention invariants or 
> covariance again for now: they don't seem very relevant in the main Racket 
> use cases

You need to wrap your head around boundaries. Google for Robby’s keynote at 
ICFP in Goteburg and try to scan this paper: 


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