Function flip_points 

pub fn flip_points<A>(
    framework: &WeightedFramework<A>,
    target: &A,
    mode: AcceptanceMode,
) -> Result<Vec<f64>, Error>
where
    A: Clone + Eq + Hash + Debug + Ord,

Return only the budgets at which target’s acceptance changes as β increases. Useful for the drama-manager flip-point query.