https://doc.sagemath.org/html/en/reference/modules/sage/modules/free_module_integer.html#sage.modules.free_module_integer.FreeModule_submodule_with_basis_integer.shortest_vector
Documentation for IntegerLattice.shortest_vector is not clear whether it will return an exact SVP solution or an approximate SVP solution; unlikes approximate_closest_vector and closest_vector.
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