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I change the ground truth to be a (IMO easier to work with) variant with a >= 1 bound and instead recover the = 1 variant using conseq on the original goal and the generated side conditions.
This also means that the conseq used to link the invariant with the postcondition now generates a goal to show implication rather than equivalence, making it more consistent with abstract
procfor the other program logics, improving the documentation.This is a breaking change since it slightly changes one of the goals generated by the tactic.