The joy of googling yourself!
I was (again) wondering about the deeper theories that tie type inference algorithms that use narrowing to those that use widening. A search on the web led to a comment on LTU (http://lambda-the-ultimate.org/node/1910)... Argh, that was my comment!
Nevertheless, since then, I come to accept that one is the dual of the other and that is does make sense to combine the narrowing and widening either to simplify the type inference algorithm or to implement "approximate" types.
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