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Many of the lattice tests were essentially copy-pasted from one lattice to the
next because they all tested isomorphic subsets of the various lattices,
specifically in the shape of a diamond. Refactor the code so that all lattices
that have tests of this shape use the same utility test functions.
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Since these methods, which operate on lattice elements, moved to the lattice
types, it no longer makes much sense for their parameters to be called `self`
and `other`. Rename them to `joinee` and `joiner` for joins and `meetee` and
`meeter` for meets.
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This lattice "lifts" another lattice by inserting a new bottom element
underneath it.
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Given a type `T`, `Flat<T>` is the lattice where none of the values of `T` are
comparable except with themselves, but they are all greater than a common bottom
element not in `T` and less than a common top element also not in `T`.
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