How do people deal with the incomplete values involved in interactively constructing a value of an ADT? You start with nothing, you end with a complete value: you represent your partial, intermediate values ... how? #Scala, #Haskell, other (but functional).
Replying to @milessabin
I don't have a great answer for this, but if that great answer exists, it should also be applicable to evolving versioned APIs which need so support some backwards compatibility.
7:40 AM - 28 Mar 2018
from East Worldham, England
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