Function suggest_bisect 

pub async fn suggest_bisect(
    this: &(impl DagAlgorithm + ToIdSet + ToSet + IdConvert + ?Sized),
    roots: Set,
    heads: Set,
    skip: Set,
) -> Result<(Option<Vertex>, Set, Set)>

Implementation of suggest_bisect.

This is not the default trait implementation because the extra trait bounds (ToIdSet, ToSet).