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AnimalMuppet
on June 22, 2015
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A Path to Enlightenment in Programming Language Th...
I'm not the one you were replying to, but maybe seanmcdirmid means this:
https://en.wikipedia.org/wiki/Covariance_and_contravariance_...
But I thought that was pretty well understood, so I don't know what he thinks is open...
seanmcdirmid
on June 23, 2015
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For many popular type systems with generics, not really; e.g. see
http://www.cs.cornell.edu/~ross/publications/mixedsite/mixed...
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But I thought that was pretty well understood, so I don't know what he thinks is open...