At Clojurewest 2016, Matthias Felleisen gave a great keynote about the 
pragmatism of soundness for maintening large code bases. He mentioned that 
adding type gradually was useful, but only when the border between typed land 
and untyped land is guarded. He mentioned how Racket does that. He also talked 
about the cost of doing so, which seem to remain an open question.

I'm wondering if any of this has been taken up by somebody in Clojure to try to 
do the same? My understanding is typed clojure does not protect the border 
between typed and untyped. Therefore, you do not have the guarantee that your 
typed code will be correct for all its usage.

Also, does anyone know exactly what he meant by the cost? Is doing gradual 
typing causing slower runtimes, slower compilation, does it hamper the 
dynamism, etc.

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