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We export a function in UGraph to check that a polymorphic instance is
a subtype of another, instead of rolling up our own in module code.
We also add a few tests for module subtyping in presence of polymorphic
constants.
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We export the relevant level equality function in UGraph which is way faster
than checking that each one is smaller than the other as universes.
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1. The Univ module now only cares about definitions about universes.
2. The UGraph module contains the algorithm responsible for aciclicity.
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